HEALTHY  WEIGHTS DURING PREGNANCY

FOLLOW A HEALTHY DIET

as recommended by your medical provider.  For a single baby, a 11-20 pound gain is recommended and for twins a 25 pound gain or more is recommended.

MODERATE OBESITY IS INCREASING IN PREGNANCY

Moderate obesity is a pre-pregnancy BMI of 25-40.  You  can calculate yours here.

If you are diagnosed with gestational diabetes and or high blood pressure you will need extra monitoring.  If you have trouble sleeping, you may need extra oxygen due to the increased weight from the pregnancy causing obstructive sleep apnea (OSA).  

OBESITY DOES NEGATIVELY IMPACT FETAL BRAIN DEVELOPMENT,

but the effect is not generally reversible with higher choline levels.  Choline and folic acid with prenatal vitamins will protect your baby from other risks.  Furthermore, depression and infection are more common in obese pregnant mothers.  Choline levels are not dependent on BMI.  You are likely to need choline supplements, along with prenatal vitamins, regardless of your weight.