I can't really chime in on the weight gain thing because I really didn't gain much at all with my last pregnancy (he's 4 months old now). I gained a total of 8lbs but it fluctuated up and down consistently. Some weeks I would gain 5-6 lbs and others I would lose it all. The baby was 7lbs 6oz at birth so technically I actually lost weight during the pregnancy when you consider water, blood and placenta weight on top of baby weight. I really wasn't able to eat a whole lot because of my sleeve and I was sick the entire way through (was similar in my first pregnancy prior to my surgery but this one was way worse). However, I can tell you that if you can breastfeed and pump, you should TOTALLY do it.... I'm still losing weight and I'm sure it's from breastfeeding because my appetite is fine now. Keep in mind that being pregnant doesn't mean you have to eat a lot more. In fact, I ate a lot less because most of what I did manage to eat... didn't stay down!