2 kids with nonimmune hydrops, 1 f 2 1/2 yrs, 1 m 3 months?

Hydrops fetalis, : Excessive fluid build-up in 2 or more body parts in a fetus, can be pretty severe, as you describe. Non-immune hydrops can be from heart or lung problems, severe anemia (alpha-thalassemia or infections), genetic syndromes or problems in fetal development. I'd seek evaluations of both kids by a geneticist to look for a cause ; by your state's early intervention program to assess their development.