Well I would definately feel okay about handing your babe of to catch a nap, but is it possible that your baby is just comfort nursing because of the stress? He can definately tell when you are stressed. You could always call and see if you can get just a weigh in appt to reassure yourself, but it sounds like your supply is probably just fine. I would agree with you that its a growth spurt, but you said a couple of weeks? I am not sure, but that seems like a long time to be having a spurt. BFed babies just eat more often, so tell your MIL that it's normal. Especially if he's just 3 months old. There is nothing bad about your milk, believe me!! If you are truly worried about supply, you could always eat a bowl of oatmeal in the mornings, and drink Mother's Milk tea to 'passively' increase your supply, but honestly as long as you keep feeding on demand, you should be fine. And he wouldn't be having a lot of wet and poopy diapers if he wasn't getting what he needed. Does he some content enough between feedings?