I breastfeed and formula feed. My baby usually poops about 3-4 times a day. Yesterday he o my pooped once and today he hasn't pooped yet. I'm getting a bit worried because I don't want him cranky and uncomfortable. I've give him Karo syrup as directed by the pediatrician and I've also given him mylicon(gas drops) still nothing... any advice? My son is 7 weeks today.