Table 3.

Milestone acquisition and regression

Developmental milestone	Number acquired n (%)	Number regressed n (%)	Acquisition age (mo) Median (range)	Regression age (mo) Median (range)
Social smile	38 (93)	3 (8)	4 (2–48)	12 (7–204)
Sustained eye contact	30 (73)	1 (3)	6 (3–72)	12 (12)
Reach for an object	39 (95)	0 (0)	6 (1–60)	N/A
Transfer from hand to hand	35 (85)	1 (3)	9 (4–48)	NR
Sit without propping	34 (83)	3 (9)	10 (5–48)	48 (7–192)
Speak first words	25 (61)	10 (40)a	14 (7–48)	36 (12–144)a
2–3 word sentences	19 (46)		24 (15–72)
Walk without support	29 (71)	1 (3)	18 (11–43)	NR
Grasp (regression only)	NR	4 (10)b	NR	24 (12–36)

^aLanguage regression was not broken down by skill and included as a general loss of language

^bPercentage reported out of total sample as number with acquisition unknown

N/A—not applicable; NR—not reported