Any Comments about how you think the momma is having twins. They probably aren’t, and they are VERY sure about that.
Any mention of the momma’s size. Women gain different amounts of weight and carry it in different places. The same woman can also have different experiences with weight in different pregnancies. Calling a momma “too big” or “too small” can really impact their view of themselves.
Momma is seeing a physician or midwife for a reason. While she is probably being respectful and listening to whatever advice you are giving, it is probably making her feel like you are undermining her doctor, and she may start to doubt what her doctor is saying. Leave the medical advice to the professionals!
What was the worst thing someone said to you during pregnancy?