Table 3.

Developmental milestones of children with Rubinstein-Taybi syndrome compared with typically developing children

Milestone	Rubinstein-Taybi syndrome		General population (Dowman 2012)
	Mean age (months)	Range	Mean age (months)	Range
Laughing	2.5	2–6	2	2–6
Rolling over	10	4–18	6	5–9
Sitting	16	9–24	7	6–12
Crawling	19	12–36	9	8–12
Standing	29	11–80	9	8–18
Walking	35	18–54	14	12–18
First words	24	6–84	12	8–18