Table 3

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

 MilestoneRubinstein-Taybi syndromeGeneral population (Dowman 2012)
Mean age
(months)		RangeMean age
(months)		Range
Laughing2.52–622–6
Rolling over104–1865–9
Sitting169–2476–12
Crawling1912–3698–12
Standing2911–8098–18
Walking3518–541412–18
First words246–84128–18