So, that is 9-10 hours baby mostly sleeping without eating, and even a longer time, without either breastfeeding or pumping. Do I have that right?We typically give her the night bottle at 10 pm and she usually falls asleep around 11pm and sleeps until 7.30-8 am.
My breasts are VERY full in the morning, so I guess there is a lot of foremilk there! Do you think pumping some of it away before I feed her could help?
So, this kind of a sleep stretch with no awakening is very unusual for a 12 week old baby, and actually would be unusual for any child under 3 or 4 years old! More typically, after about this age-3 months, some babies start sleeping 'through the night' which means 5 hours at once. Some. certainly not all.
If your baby were sleeping this long without getting a nighttime bottle, and also no nighttime pacifier, and no swaddling, and sleeping near you (in the same room if not same bed) and baby was sleeping this long, and baby was gaining well and happy, it would probably just be normal for your baby to sleep so long. But I would probably say, “look out, this will not last long!”
But since baby IS getting a bottle, and maybe some of these other 'sleep lengthening" techniques, AND this is a very long stretch, almost twice the longest that is normal for this age, and baby is fussy during the day, and you are so full in the morning, this all spells trouble to me. Maybe not YET, but, eventually.
I DO NOT think your milk production has been negatively affected, as in, lowered, not yet, not judging from what you have said. And if it has, yes of course it is reversible. The way you reverse production that has gone down due to not nursing frequently enough is to nurse baby more often and stop having such a long stretch of time at night with no nursing. It is too long. Babies normally require nutrition overnight. This may also explain why baby still needs to nurse very frequently during the day. (but again that could just be normal)