Re: is my milk decreasing?
If you're feeding on demand, and you're not pregnant, and not on new hormonal birth control, your milk won't spontaneously dry up. It just doesn't work that way. Sometimes your supply will dip a bit right before your period, but if you feed on demand, it will bounce right back up.
I would be more inclined to blame the increased night waking on teething, or a new developmental milestone, or a growth spurt, or an ear infection. Or it could be that your baby has just decided that she likes nursing at night- it's so soothing, it's so cuddly, it's a pleasant way for a baby to get back to sleep...
How can you tell if your milk supply is adequate? Just watch your baby's diapers. If she is making plenty of wets, she's getting enough to eat. At 7 months, poops per day is not a good indication of how much she's getting, because her digestive system is more mature and she's extracting almost all the nutrition from the milk she's taking in, without a lot of waste left over. Some babies can go up to a week between poops, and it's normal.
Should you pump? Unless you have to do it for work or for a sitter, I wouldn't bother. It's not generally a good indicator of how much milk you're making, particularly if you haven't done it much up until now.
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