Re: My mother in law is pushing me to introduce cereal
It it not recommended to introduce solids before 4 months of age, no matter how developmentally advanced a baby is. Many experts recommend not introducing solids until 6 months- this article from kellymom explains why: http://kellymom.com/nutrition/starti.../delay-solids/. For me, the best reason to stay away from solids is that any time you feed baby a solid, it replaces some breastmilk in his diet. Breastmilk is nutritionally complete and supports a healthy immune system. Solids aren't and don't. Particularly cereal, which is fortified with vitamins and minerals but is otherwise nutritionally void. It's just pure starch and many moms do not use it as a first food.
When you say you have your LO on a feeding schedule, what do you mean exactly? Schedules are often the enemy of successful breadtfeeding because breastmilk supply = demand. If you restrict demand by spacing out feedings, you can end up with reduced supply and a baby who is miserable and not growing the way he should. You don't want to introduce a schedule in the hopes of seeing "regular" stools: breastfed babies often have irregular pooping patterns, and that is normal. Some babies will poop many times a day, others will poop just once a week or so. You should not look for a "regular" 1x per day poop pattern until your baby is eating a lot of solid foods, and achieving that pattern is not a reason to introduce solids.
WRT your mother-in-law, be firm and be clear. You are the mama, you make the decisions. If you let your MIL push you on solids, it's not going to stop there. She'll be pushing you on when to wean, and how much tv you let your kid watch, and when your kid can pierce his ear, and what college he will go to. Draw your boundaries now and avoid conflict later.
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!"