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. Author manuscript; available in PMC: 2026 Jul 30.
Published in final edited form as: Infant Behav Dev. 2025 Jul 30;80:102117. doi: 10.1016/j.infbeh.2025.102117

Table 3.

Battery order of the NIH Baby Toolbox

Order Age in Months
1–5 months 6–8 months 9–15 months 16–21 months 22–24 months 25–36 months 37+ months

1 Sit and Stand Mullen Visual Reception Social Observation Social Observation Social Observation Social Observation Social Observation
2 Get Up and Go Sit and Stand Familiarization Familiarization Mullen Receptive Touch Screen Tutorial Touch Screen Tutorial
3 Mullen Receptive Get Up and Go Mullen Receptive Mullen Receptive Mullen Expressive (Prompted) Delayed Memory (Learning) Delayed Memory (Learning)
4 Mullen Expressive (Prompted) Familiarization Looking While Listening Looking While Listening Looking While Listening Visual Delayed Response Visual Delayed Response
5 Mullen Visual Reception Mullen Receptive Mullen Expressive (Prompted) Mullen Expressive (Prompted) Sit and Stand Delayed Memory (Test) Delayed Memory (Test)
6 Reach to Eat Looking While Listening Sit and Stand Sit and Stand Get Up and Go Mullen Receptive Mullen Receptive
7 Mullen Expressive (Observational) Mullen Expressive (Prompted) Get Up and Go Get Up and Go Touch Screen Tutorial Mullen Expressive (Prompted) Mullen Expressive (Prompted)
8 Reach to Eat Mullen Visual Reception Mullen Visual Reception Delayed Memory (Learning) Picture Vocabulary Picture Vocabulary
9 Mullen Expressive (Observational) Reach to Eat Reach to Eat Visual Delayed Response Sit and Stand Sit and Stand
10 Mullen Expressive (Observational) Mullen Expressive (Observational) Delayed Memory (Test) Get Up and Go Get Up and Go
11 Mullen Visual Reception Counting (Verbal) Counting (Verbal)
12 Reach to Eat Counting (Object) Counting (Object)
13 Mullen Expressive (Observational) Subitizing Subitizing
14 Who Has More Who Has More
15 Mullen Visual Reception Verbal Arithmetic
16 Reach to Eat Mullen Visual Reception
17 Mullen Expressive (Observationl) Reach to Eat
18 Mullen Expressive (Observational)