Beta coefficients for weight-for-age z-scores (WAZ; N=628), length-for-age/height-for-age z-scores (LAZ/HAZ; N=628), and body mass index z-score (BMIZ; N=628) by gestational weight gain (GWG).

	WAZ Adjusted* beta coefficient (95% CI)	LAZ/HAZ Adjusted* beta coefficient (95% CI)	BMIZ Adjusted* beta coefficient (95% CI)
Intercept	−0.31 (−0.52, −0.11)	−0.08 (−0.30, 0.15)	−0.40 (−0.60, −0.19)
Child’s age (months)	0.05 (0.04, 0.07)	−0.01 (−0.02, 0.01)	0.08 (0.06, 0.09)
Inadequate GWG vs. adequate GWG	−0.38 (−0.60, −0.16)	−0.21 (−0.46, 0.04)	−0.44 (−0.69, −0.20)
Inadequate GWG * child’s age	0.02 (−0.001, 0.04)	0.003 (−0.02, 0.03)	0.03 (0.01, 0.06)
Inadequate GWG * child’s age squared	−0.0003 (−0.001, 0.0002)	0.0001 (−0.001, 0.001)	−0.001 (−0.001, 0.00001)
Excessive GWG vs. adequate GWG	0.30 (0.12, 0.49)	0.21 (−0.01, 0.42)	0.25 (0.04, 0.45)
Excessive GWG * child’s age	−0.02 (−0.03, −0.001)	−0.01 (−0.03, 0.01)	−0.02 (−0.04, 0.004)
Excessive GWG * child’s age squared	0.001 (0.0001, 0.001)	0.0003 (−0.0002, 0.001)	0.001 (−0.0001, 0.001)

^*Multivariable linear model adjusted for prepregnancy body mass index, child’s age squared, inadequate × child’s age squared, excessive × child’s age squared, maternal education, pattern of prenatal alcohol, marijuana, cigarette smoking, ever breastfed infant, and solid foods introduced ≥6 months.