No growth retardation cases were observed during the infancy period. The average height and weight of the infants were in the normal range at delivery and at 6 weeks of age, but were higher than the reference range at 12 months of age (p < 0.05). The physical development status of 92.59% of the infants was in the normal range at 6 weeks of age. The heights (63 cm) of two infants were higher than the reference value, one infant (6.4 kg) was heavier than the reference. The other two infant's heights (one was 54.5 cm and the other was 6.4 cm) were lower than the reference value at 6 weeks of age. The physical development status of 98.15% of the infants was in the normal range at 12 months of age; only one infant (81.7 cm) was taller than the reference.
The body mass index (BMI) of both groups increased gradually with age (p < 0.05) ( Table 3). BMI was in the normal range for the majority of the children; only one male infant's BMI (11.05 kg/m2) at 6 weeks was lower than the 95% reference range, and one infant's BMI (21.22 kg/m2) at 12 months was higher than the 95% reference range. There were no significant differences in BMI between the early-pregnancy treatment and late-pregnancy treatment groups during infancy (p > 0.05).