Figure 5. Mean Difference in Length / Height, Weight, and Body Mass Index (BMI) Between Offspring Conceived via Assisted Reproductive Technology (ART) and Those Who Were Naturally Conceived (NC), Separately for Offspring Conceived Using Fresh Embryo Transfer (ET) and Frozen-Thawed Embryo Transfer (FET).

Cohort-specific results were adjusted for maternal age, parity, BMI (calculated as weight in kilograms divided by height in meters squared), smoking, education, ethnicity or country of birth, plus offspring sex and age The number of offspring at each age varied from 1904 offspring conceived by fresh ET, 303 offspring conceived by FET, and 78 128 offspring who were NC for weight at age 3 to 5 months to 433 offspring conceived by fresh ET, 84 offspring conceived by FET, and 15 490 offspring who were NC for BMI at age 17 to 23 months.