Table 3.

Adjusted* longitudinal regression estimates and 95% CI in analyses examining motor milestone achievement and subsequent weight-for-length z score from 3 to 12 months

Age of motor milestone achievement	Estimate	95% CI	P value
All infants (n=425)
Rolling over (ref=older than 4 months)
4 months or younger	−0.19	−0.40 to 0.008	0.06
Sitting up (ref=older than 6 months)
5 months or younger	0.19	−0.06 to 0.43	0.13
5–6 months	0.22	−0.03 to 0.48	0.09
Crawling (ref=9 months and older)
6 months or younger	−0.34	−0.59 to −0.09	0.008
7–8 months	0.01	−0.20 to 0.21	0.94
Walking (ref=older than 12 months)
11 months and younger	−0.17	−0.39 to 0.06	0.14
12 months	0.13	−0.10 to 0.37	0.27
Male infants only (n=208)
Rolling over (ref=older than 4 months)
4 months or younger	−0.29	−0.60 to 0.02	0.06
Sitting up (ref=older than 6 months)
5 months or younger	0.18	−0.17 to 0.54	0.31
5–6 months	0.27	−0.10 to 0.64	0.15
Crawling (ref=9 months and older)
6 months or younger	−0.46	−0.83 to −0.10	0.01
7–8 months	−0.06	−0.37 to 0.25	0.91
Walking (ref=older than 12 months)
11 months and younger	−0.09	−0.44 to 0.26	0.63
12 months	0.08	−0.28 to 0.44	0.66
Female infants only (n=217)
Rolling over (ref=older than 4 months)
4 months or younger	−0.12	−0.40 to 0.16	0.39
Sitting up (ref=older than 6 months)
5 months or younger	0.18	−0.16 to 0.52	0.30
5–6 months	0.16	−0.20 to 0.53	0.37
Crawling (ref=9 months and older)
6 months or younger	−0.27	−0.63 to 0.08	0.13
7–8 months	0.05	−0.24 to 0.33	0.75
Walking (ref=older than 12 months)
11 months and younger	−0.25	−0.56 to 0.05	0.10
12 months	0.20	−0.14 to 0.54	0.24

*Adjusted for maternal prepregnancy body mass index, age and education; household income; infant race, gender, birth weight for gestational age z score and breast feeding.