Hello OP congratulations on your beautiful baby.
I hope you will find what I have to say helpful, but I will preface by saying, I am not qualified, and encourage you to try and seek support from a lactation consultant.
I will also say that, when you are in hospital, the nurses and doctors will try and find the quickest ‘medical’ solution to a problem. Quite understandably! So, in this instance it will be giving top ups to the baby. So, that will be the angle they will come from in the first instance.
Ok, I have 4 children. I’m still breastfeeding the youngest (16 months), I’ve exclusively breastfed all of them, for quite a while each.
My experience is:
Nipples: ok I know ideally the nipple shouldn’t be lipstick etc, but each of my children has done this at the start while we got used to each other. It’s not ideal, but it was functional, and did right itself.
Take your bra off and let air at your nipples. They will be sore. Try and get multi-mam nipple compresses to aid recovery of the small scabs.
I know everyone says it shouldn’t hurt, but, having a sensitive part of your body repeatedly sucked on for hours at a time, will hurt. Until your body adapts.
Oh also, their mouth should look like a little fish while feeding (lips out not tucked in, if that makes sense)? I used to just gently use my little finger to bring their lips out of they weren’t.
There’s a lot of advice about latch and doing things ‘right’, I never really managed all that perfectly, but I got the baby on, and we managed to jumble along ok between us!
Supply
Breastfeeding is demand and supply. The more you keep your baby on the boob, the better the whole thing will function.
It’s hard with your first baby, as it’s overwhelming and boring, and honestly, baffling that something so small could want food again!!
Stick with it!! Your milk is in, you are doing brilliantly.
keep her on the boob all day, as much as you can. The fewer top ups the better really, as that affects the demand/supply equation. (But I can’t give medical advice so, you know, do what is right for you!)
For what it’s worth, my eldest lost similar weight, I was beside myself and worried non stop for months…. He’s now 9 and wonderful!
You are doing a brilliant job!