Key Highlights
- "First day" usually refers to one of two different visits: the initial assessment or the first hands-on therapy session, and they look quite different.
- Most first sessions are deliberately low-demand, focused on building rapport rather than formal teaching.
- Your child is very unlikely to be asked to sit at a table or complete structured tasks on day one.
- Data collection starts immediately, even during a session that looks like simple play.
- Your role on day one is more about being available and honest with the therapist than performing any specific task yourself.
- A comparison table breaks down exactly how an assessment visit differs from a first therapy session.
- Some early tears, hesitation, or clinginess are common and expected, not signs that something is wrong.
Starting ABA therapy brings a mix of relief and nerves for most families, and a lot of that nervousness comes down to simply not knowing what the first visit will actually look like. Will a stranger show up and expect your child to perform on command? Will there be paperwork, or games, or both? The honest answer is that "the first day" can mean two different things depending on where your family is in the process, and understanding that distinction removes a good amount of the uncertainty. This guide walks through both versions of day one: the initial assessment and the first actual therapy session, so you know what's coming either way.
Quick Answer: What Happens on the First Day of ABA Therapy?
The first visit is typically either a comprehensive assessment conducted by a BCBA, or, once a treatment plan is in place, a low-demand therapy session focused on building rapport rather than formal teaching. In both cases, your child is unlikely to be asked to sit still, complete drills, or perform on command right away. Data collection begins immediately, but the visible experience is closer to structured play or a conversation than a clinical evaluation.
Two Different "First Days": Assessment vs. First Therapy Session
Families often use "first day of ABA" to describe either the initial evaluation or the first hands-on session, and mixing these up is one of the most common sources of confusion before starting treatment. The assessment is typically conducted by a BCBA and focuses on understanding your child's current skills, communication style, and behavior patterns using structured tools and direct observation. According to the Autism Speaks Parent's Guide to ABA, an initial assessment commonly includes an in-depth parent interview alongside standardized measures such as the Assessment of Basic Language and Learning Skills (ABLLS-R) or the Verbal Behavior Milestones Assessment and Placement Program (VB-MAPP). The first therapy session, once a treatment plan has been built from that assessment, looks different again and is described in more detail below.
Assessment VisitFirst Therapy SessionConducted byBCBARBT, with BCBA oversightPrimary purposeUnderstand skills, needs, and goalsBuild rapport and begin the treatment planTypical activitiesStandardized assessments, parent interview, direct observationLow-demand play, preference identificationDemands placed on childMinimal; mostly observationalVery low; focused on connectionTypical length1 to 3 hours, sometimes split across visitsMatches the prescribed session length
What Happens During the Initial Assessment
The assessment is largely about the BCBA getting an accurate picture of your child, not testing them in a way that feels like a quiz. Expect questions directed at you about your child's routines, strengths, communication style, and the specific concerns that led you to seek services. The BCBA will also observe your child directly, often during unstructured play, to see how they interact with their environment and communicate their wants and needs. This information, combined with standardized tools, becomes the foundation for the treatment plan your child's team will build. It's normal for this visit to take longer than a typical session and to feel more clinical than the sessions that follow, since the goal is a thorough, accurate picture rather than a quick snapshot. Some families find it helpful to write down specific examples beforehand, a recent meltdown and what preceded it, or a skill their child has been working on at school, since concrete details tend to be more useful to a BCBA than general impressions.
What Happens During the First Actual Therapy Session
Once a treatment plan is in place, the first hands-on session is intentionally different from what many parents picture. Rather than diving into structured teaching, most providers spend early sessions on what's often called rapport-building or pairing: the therapist engages in activities your child already enjoys, with few or no demands attached, so your child begins to associate the therapist with positive experiences rather than pressure. This isn't a delay tactic. A child who is anxious or unfamiliar with a new adult is unlikely to show their actual abilities or engage meaningfully with teaching, so this groundwork genuinely supports everything that comes after it. The BACB's Ethics Code reinforces this priority directly, requiring that behavior-change interventions be designed to best meet the diverse needs of each client rather than following a fixed script regardless of readiness.
What Your Child Will (and Won't) Be Asked to Do
On day one, your child will very likely not be asked to sit at a table, complete a worksheet, or perform a specific skill on command. What they will likely experience is a therapist who follows their lead: playing with a preferred toy, offering choices, and gradually introducing small, easy requests only once the child seems comfortable. According to the CDC, naturalistic teaching approaches embed learning opportunities directly into activities the child is already engaged in, rather than requiring a child to disengage from play to complete a separate task. Many providers describe this same idea as play-led, purposeful therapy paced by the child, where the first steps of any session are about connection before any specific goal is introduced.
What Your Role Looks Like on Day One
Parents often expect to be given a task or a script, and are surprised when the honest answer is closer to: be present, be honest, and let the therapist do their job. You'll likely be asked detailed questions about your child's daily routines, what motivates them, and what tends to cause distress, and your accurate answers directly shape how the session unfolds. Whether you stay in the room or step back typically depends on your child's comfort level and the provider's specific approach; ask this directly before the visit so you know what to expect rather than guessing in the moment.
In our experience, the families who feel most at ease on day one are usually the ones who came in with realistic expectations rather than a specific picture of what "progress" should look like on day one. We've seen sessions where a child spent the entire hour simply playing cars back and forth with a new therapist, barely speaking, and the family worried nothing had been accomplished. In reality, that child left the session having built a foundation of trust that made every session afterward go more smoothly. The pace that looks slow in the moment is often exactly what makes the following weeks work.
What to Have Ready
A few simple things make the day smoother without requiring extensive preparation. Have a couple of your child's favorite toys or snacks accessible, since these are often used to build rapport. Keep insurance and intake paperwork on hand in case anything needs to be confirmed. If your child has a specific communication tool, whether a picture system, a device, or a set of signs, make sure it's available and let the therapist know how your child typically uses it. Logistical questions that come up before day one, like insurance coverage or what happens if a session needs to be rescheduled, are often covered on a provider's FAQ page as well.
Signs It's Going Well (and When to Flag a Concern)
A good first session doesn't necessarily look dramatic. Signs it's going well include your child engaging with the therapist even briefly, the therapist following your child's lead rather than pushing an agenda, and clear communication from the provider about what happened and why. It's also normal for a first session to include some resistance, tears, or a child who mostly ignores the new adult in the room; this is common and typically improves as rapport builds over the following sessions. A brief debrief at the end of the visit, even a few sentences on what the therapist noticed and what to expect next time, is a reasonable thing to expect and ask for if it isn't offered. What's worth flagging to your BCBA is a pattern that doesn't shift over several sessions, a therapist who seems to push demands despite your child's visible distress, or vague answers when you ask what specifically happened during a session.
Walking In With Realistic Expectations
The first day of ABA therapy is rarely the dramatic, high-pressure experience many parents brace for. Whether your family's first visit is a formal assessment or a low-demand session focused on rapport, the goal of that day is the same: gathering accurate information and building a foundation your child can actually engage with, not rushing straight into structured teaching. Knowing this ahead of time tends to lower the stress of the day considerably, for both parents and children.
Centerbrite is based in New Jersey, serving families across Bergen, Essex, and Morris counties. Every first visit, whether an assessment or an early session, is guided by a BCBA who explains exactly what to expect before your child's team ever walks through the door. If you're preparing to start ABA therapy and want a clear picture of what your family's first day will look like, reach out to us today!
Frequently Asked Questions
1. Will my child do any structured "work" on the first day?
Almost certainly not in a formal sense. Most first sessions focus on building rapport through play and low-demand interaction, with structured teaching introduced gradually over the following sessions once the child is comfortable.
2. How long is the first session?
This depends on the specific visit. Assessment visits often run one to three hours, sometimes split across more than one appointment. A first therapy session typically matches the length of a regular prescribed session.
3. What if my child cries or refuses to engage with the therapist?
This is a common and expected reaction to a new person, especially on day one. Experienced therapists are trained to respond calmly, reduce demands, and let the child set the pace, and this information also helps the team understand what supports your child during transitions.
4. Do I need to stay in the room during the first session?
This depends on your child's comfort level and the specific provider's approach. Ask directly before the visit, since some families stay nearby throughout while others give the therapist and child more independent space as rapport develops.
5. What happens after the first day?
Following the assessment, the BCBA builds a formal treatment plan with specific goals. Following a first therapy session, subsequent sessions gradually introduce more structured teaching as the child becomes comfortable with the therapist, based on the data collected along the way.
Sources:
- https://www.cdc.gov/autism/treatment/index.html
- https://www.autismspeaks.org/sites/default/files/2018-08/Applied%20Behavior%20Analysis%20Guide.pdf
- https://www.bacb.com/wp-content/uploads/2022/01/Ethics-Code-for-Behavior-Analysts-240830-a.pdf
- https://trueprogresstherapy.com/blog/what-to-expect-on-the-first-day-of-aba-therapy/
