Re: 4 month old not gaining weight
Thanks for posting that history! Based on what you've posted, I don't see a reason for concern. Check out that chart I linked to in my previous post- your baby has been cruising up the fiftieth percentile since birth. Sometimes above it, sometimes below it, just wiggling around a curve like a very typical breastfed baby.
If you take a look at the chart, you will notice that the curves start to flatten out as time goes on. In other words, it is normal for breastfed babies to decrease their rate of weight gain somewhere around the middle of the first year. Some kids start this process of "leaning out" a little earlier, some a little later. Both my girls started to drop percentiles at around 4-6 months. This is a different pattern of weight gain from the one typically expressed by formula-fed babies, which is why it is important to evaluate breastfed babies using the charts for breastfed babies! If your doctor was looking at a chart for formula-fed babies- and most docs are still using the formula charts- your baby is going to look too skinny because the weight gain curves for formula-fed infants do not flatten out as fast as the ones for breastfed babies do.
I don't think I would worry too much. It would not hurt to nurse as often as possible, and to keep an eye on diaper output and weight gain, but I wouldn't go to formula or freak out about the duration of your nursing sessions.
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!"