IVF 27 weeks, the baby’s head is two weeks large, need to perfect the sugar tolerance test, four-dimensional ultrasound examination and chromosome examination, etc.. 1. Glucose tolerance test: Glucose tolerance test needs to be perfected at 26-28 weeks of pregnancy to determine whether the pregnant woman is combined with gestational diabetes. If the pregnant woman suffers from gestational diabetes, the risk of the fetus being a macrosomia will increase. 2. Four-dimensional ultrasound examination: Pregnant women need to perfect four-dimensional ultrasound examination around 22-26 weeks of pregnancy, through four-dimensional ultrasound to observe whether the fetal tissues and organs are developing normally and whether there are any malformations. 3. Chromosomal examination: Pregnant women need to pass NT examination and Down’s syndrome screening before the 23rd week of pregnancy to initially assess whether the fetus may suffer from chromosomal abnormality, and if necessary, they also need to do non-invasive DNA examination or amniocentesis to clarify the chromosomal condition of the fetus. If the pregnant woman does not have gestational diabetes, 4D ultrasound and chromosome examination did not see obvious abnormalities, then the baby head is large two weeks to consider the accounting of gestational week error or the baby’s individual differences and other reasons for the cause. Pregnant women should undergo regular prenatal checkups during pregnancy to monitor their own health and that of their fetus, and seek prompt medical attention in case of discomfort.