Table 2.

Socio-communicative functions observed (■) or not observed (□) for each participant between 9 and 12 months of age who was later diagnosed with FXS. Categories according to the Inventory of Potential Communicative Acts (IPCA; Sigafoos et al., 2006)

	Social convention	Attention to self	Reject/protest	Request object	Request action	Request information	Comment	Choice making	Answer	Imitate	Total
Child 1	□	■	□	■	□	□	■	□	■	□	4
Child 2*	□	■	□	■	□	□	■	□	■	□	4
Child 3#	■	■	□	□	□	□	□	□	■	□	3
Child 4#	■	■	□	□	□	□	■	□	■	□	4
Child 5	■	■	■	■	□	□	■	□	■	□	6
Child 6	■	■	□	■	□	□	■	□	■	□	5
Child 7	□	■	□	■	□	□	□	□	■	□	3
Total	4	7	1	5	0	0	5	0	7	0

^*FXS+ASD

^#twins