Table 1.

Gestational time points of prenatal visits in the nuMom2B study

Visit	Weeks of Gestation
Visit 1	$6^0$ - ${13}^6$(6 weeks and 0 days to 13 weeks and 6 days)
Visit 2	${16}^0$ - ${21}^6$(16 weeks and 0 days to 21 weeks and 6 days)
Visit 3	${22}^0$ - ${29}^6$(22 weeks and 0 days to 29 weeks and 6 days)
Visit 4	The time of delivery