When a family comes to us with a toddler who has just received an autism diagnosis, the first question they almost always ask is: what happens now? The diagnosis is overwhelming enough. The idea of starting intensive therapy for a child who may still be in diapers — a child whose days consist of play, snacks, and naps — can feel impossible to picture.
This article is a practical walkthrough of what early intervention ABA actually looks like for toddlers, what the first 90 days involve, and what parents need to understand to be effective partners in the process.
Before therapy begins: the intake and assessment phase
ABA therapy does not begin on day one with a therapist sitting across from your child running drills. The first step is a comprehensive assessment conducted by the supervising BCBA. For a toddler, this typically involves a combination of parent interview, direct observation of the child during play and structured activities, and administration of one or more standardized assessment tools.
Common assessments used with toddlers include the VBMAPP (Verbal Behavior Milestones Assessment and Placement Program), the ABLLS-R (Assessment of Basic Language and Learning Skills), and the PEAK Relational Training System. These tools identify where the child currently is across domains including communication, social skills, self-care, motor skills, and play — and they inform the goals that will be targeted in therapy.
The assessment phase typically takes one to three sessions. Families should expect detailed questions about their child's daily routines, communication methods, preferred activities, challenging behaviors, and developmental history. The more specific you can be, the more useful the assessment will be for building an individualized program.
What the first weeks look like
The earliest sessions for a toddler serve two purposes: building rapport and gathering information. A skilled RBT working with a young child will spend the first several sessions following the child's lead — finding out what motivates them, what they find aversive, how they communicate, and how they respond to different types of interaction. This is not wasted time. It is the foundation of everything that follows.
This phase can be frustrating for parents who want to see clear skill-building activity from the beginning. The research is clear, however, that intervention built on a strong foundation of motivation and positive rapport produces better and faster gains than instruction that begins before the child is engaged with the therapist.
Within the first two to three weeks, the BCBA will finalize the initial treatment plan and set measurable goals across skill domains. For a toddler, early goals typically focus on foundational skills: making requests (manding), imitation, attending, basic receptive language, and functional communication. These are the building blocks for everything else.
The role of play in early intervention
Parents sometimes arrive expecting their child's therapy to look like school — a table, materials, structured drills. For toddlers, quality early intervention looks like something else entirely: purposeful play.
Natural Environment Teaching (NET) and Pivotal Response Training (PRT) are two ABA approaches specifically designed for young learners that embed learning opportunities into the child's natural activities and preferred toys. A therapist working with a two-year-old might target requesting skills while blowing bubbles, imitation during a song, or turn-taking during a ball game. The child experiences the session as play. The therapist is systematically creating and capturing learning opportunities throughout.
This does not mean there is no structured table time. For some skills — particularly early receptive language, matching, and certain academic prerequisites — structured discrete trial teaching is the most efficient approach. A well-designed program for a toddler will include both naturalistic and structured components, calibrated to the child's current level and goals.
Parent training is not optional
If there is one thing families need to understand before starting ABA therapy for a toddler, it is this: your involvement is not supplementary. It is central.
A child in early intervention might receive 20 to 30 hours per week of direct therapy. There are 168 hours in a week. The hours outside of therapy — morning routines, meals, bath time, play, bedtime — are where skills either generalize and strengthen or remain isolated to the therapy setting. Parents who understand the strategies their child's therapist is using and apply them consistently at home produce significantly better outcomes than parents who treat therapy as a drop-off service.
Your BCBA should be meeting with you regularly — ideally every one to two weeks — to review your child's data, explain what is being targeted, and teach you how to implement key strategies in daily routines. If this is not happening, ask for it. It is a core component of quality ABA practice, not an optional add-on.
What progress looks like at 30, 60, and 90 days
Progress in early intervention is rarely linear, and it rarely looks dramatic in the first month. The 30-day mark is typically when the therapist-child relationship is solidifying, the motivational assessment is complete, and the treatment plan is finalized. Families may notice the child is more comfortable with the therapist and more willing to engage — this is meaningful progress even if it does not feel like skill-building.
By 60 days, most families begin to see measurable movement on early targets. A child who was not requesting anything verbally may be using one or two approximations consistently. A child who resisted sitting at a table may be tolerating five to ten minutes of structured activity. Small gains in a two-year-old represent real neural change.
At 90 days, the BCBA should conduct a formal data review and, in most cases, an updated assessment. Goals that have been mastered will be replaced with more advanced targets. Goals that have not progressed will prompt a clinical conversation about why — whether the goal needs to be broken into smaller steps, whether the reinforcement strategy needs adjustment, or whether there are barriers in the environment that need to be addressed.
What to watch for and what to ask
Not all ABA programs are equally well-run. Early intervention for toddlers requires a specific set of skills from both the BCBA and the RBT. Here are the questions every family should be asking during the first 90 days.
Is my child's BCBA reviewing data and adjusting the program regularly — at minimum monthly? Is the RBT working from a written program, or improvising? Am I receiving regular parent training, not just updates? Are sessions being conducted in natural environments as well as structured settings? Is my child motivated and engaged during sessions, or are sessions characterized by frequent refusals and distress?
A child who is regularly distressed during sessions is not simply going through an adjustment period. Distress during early intervention is a clinical signal that something in the program needs to change — the reinforcement system, the session structure, the pace, or the relationship with the therapist. It should prompt a conversation with the supervising BCBA, not reassurance that things will improve on their own.
