I was a healthy BMI before pregnancy, gained 28# with my firstborn, and ended up in the NICU because the poor little (full-term) guy swallowed a bunch of mucus and meconium on his way out and had breathing problems. When I went to visit him, I was legit the lightest mom in the NICU. The good news is, he's now a very healthy, happy 9 year old with no lingering effects. He's also a little string bean who likes to run and does exercises every day for fun.