Re: 3 week old gaining weight but not pooping
Welcome to the forum!
If the baby is gaining weight well, I wouldn't worry about the infrequent pooping. Most babies poop multiple times a day until at least 6 weeks, after which some of them will go a week (sometimes more) between poops. It's possible that your baby just reached that point a bit before 6 weeks, which is a bit unusual, but not unheard of.
Breastfed babies don't get constipated, because breastmilk actually has a mild laxative effect. So no need for the Q-tip routine. However, a lot of babies find pooping or passing gas rather upsetting and even difficult, not because of hard dry stool (i.e. constipation) but rather because they haven't yet figured out all the muscular actions required to expel something from the bottom of their digestive system. If your LO seems very uncomfortable, I suggest nursing him and then putting him slightly upright in a warm bath. That often relaxes the baby enough to let things fly- though on the down side, you end up scrubbing the tub!
The frequent nursing is very normal at this age, but I would definitely mention the all-night grunting to the pediatrician.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"