My milk took 3 days to come in and colostrum wasn't enough because he lost some weight:
Milk normally takes quite a few days to some in. Colostrum usually is only a few tablespoons because baby's stomach is the size of a marble and colostrum has WAY more fat, calories and nutrients than regular breastmilk and formula. So, colostrum IS way more than enough for baby for a good bit. If you had fluids through the IV during labor, chances are baby will lose a bit more weight after birth than if you didn't...pair that with normal weight loss, you may think you need to supplement. However, what you really need to do is nurse more. The more you nurse, the more you make. Simple. The second you supplement with formula is the second you told your breast to stop making as much milk. The more you nurse, the faster your milk will come in. Just remember, colostrum DOES have more fat, calories and nutrients than formula...so why would you want to supplement and baby's stomach is the size of a MARBLE regardless of how big they were at birth...so why would you think they need a whole bottle of formula or a whole bottle of pumped breastmilk?
My milk didn't come in so I was told to supplement:
Unless it has been a week+ and baby is getting nothing out(meaning you don't hear him swallowing and he is not making any wet or poopy diapers), then, you shouldn't give formula and assume you haven't got milk. You should from birth be nursing on demand. Which may be VERY often. Baby should increase the amount of wet and poopy diapers daily up to at least 6-8 even somewhat wet daily. Baby should seem content after each feed. Baby should gain weight by each check up(meaning, baby should follow his own curve of growth).
My baby eats a lot, I must not have enough to feed him:
This falls back to the first myth...if baby IS satisfied after his feed and IS gaining weight and IS wetting/dirtying diapers, rest assured, he is getting exactly what he needs. Eating frequently is what babies do. Breastmilk digests well and growing babies eat small amounts often. Growth spurts also cause babies to eat more often. Even if baby is nonstop nursing at the breast, it doesn't mean he isn't getting full or you aren't making enough. He may be having a growth spurt, teething, feels sick...anything.
My baby was big, I couldn't keep up:
This is the craziest. Even the 16lb baby doesn't need 4oz+ in a sitting. Look at your baby's fist...their stomach in no bigger than that fist. I am grown and my hand cannot hold more than 4oz. Your baby is born with a stomach the size of a marble...even if they are huge. The stomach grows to shooter marble size after a week or two. then, it finally gets to fist size...it is supposed to STAY FIST SIZED for life. You stomach should never become bigger than your fist.
Many women do not produce enough: