Dear @Jennifer48 in my opinion, there are 3 things absolutely necessary in a young baby's life:
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a main caregiver, who has had enough sleep - preferably their mummy, but anyone who always has the baby's well-fare and happiness as their ultimate, and essential goal.
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a full tummy
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a clean and protected nappy area
I have put you, their mummy - in this particular case - having enough sleep as the most important thing for your beautiful baby. If a baby's caregiver is running on empty, and you OP most certainly are, you can maybe coast downhill for a very short while, but then the down hill bit suddenly runs out and the road turns into a very steep uphill climb, which tragically you have no chance of achieving when you are running on empty. So what can you do? You do whatever you have to do in order to get enough sleep in any 24 hour period.
That leads to the other two essential requisits for a baby's survival and happiness. Number 3 should be relatively easy to achieve; every time you change the nappy - even if it has only had urine in it, clean the area thoroughly, then apply an effective barrier cream.
Number two doesn't mean trying to force baby to have too much milk - that wouldn't work anyway - but having fed my first baby solely on breast milk for the first week or so, and then changing to mixed feeding, but individually at each feed, I found that breastfeeding my first baby, and then in the same 'meal' topping up with formula, was quite soul destroying. So I breastfed during the day, and at night-time I gave at least two formula feeds. The first when I was hoping to be able to go to sleep reasonably soon, and at the next, when the baby woke up after the first formula feed. I might have been lucky, but with those two formula feeds I usually got a 'doable' amount of sleep, if not, the next feed would have probably been a formula feed as well.
I have to be honest with you here Jennifer, my first baby soon rejected the breastfeed, which I think was because they had to work harder to get the milk from my breast, but I did have a much more settled,, and content baby when s/he went fully on to Formula. I comforted myself with the fact that at least my baby had got the benefits of my Colostrum, and at a short while of only my breast milk on top of that. Except in extreme circumstances, I always advise starring out breastfeeding, even if the mum doesn't want to do so after the initial few days.
I also tried co-sleeping with my second baby, and, maybe luckily, no harm came to my baby, and that was years before all the advice about co-sleeping safely was available. I had been determined - I now think very stupidly - to solely breastfeed my second baby, which I managed until they were fully weaned (we started weaning at 4 months old, and sorry, but I don't know why the advice has changed to wait until babies are now 6 months old, but I presume there were statistics that showed that to be safer). But, I do have one episode from my co-sleeping time that I think, and hope is safe to share here; I woke up one morning to find that my little one hadn't woken me in the night, but there was a rather big 'love bite' on the side of my chest!
I have one other practice I would like to share with you OP, and it might be totally irrelevant to you, but when my babies - whichever way fed - use to wake up and start screaming immediately for their feed, I would give them either the first breast, or half of a bottle of formula, straight away, or as soon as possible, and then change their nappy (I think that the barrier cream I advised earlier when changing a baby's nappy, helped with that aspect) at the half way point. I felt that changing the nappy half way through had two main benefits, baby was much happier, and do didn't wriggle and/or scream while having their nappy changed, and it also helped to wake baby up a bit, so they didn't fall asleep on the first breast, or too soon on the bottle.
Unfortunately, I can't give you any safe advice about how much formula to offer a baby - presumably decided on by the baby's weight at any given time - but every child is different, and sadly there are few to no absolutes when it comes to areas like this. I think that personally I would always make up a little extra of their formula - but always at the correct amount of water to powder ratio that is stipulated on the tin/carton - and if they don't want anymore, then accept that, but if they are still showing signs of hunger I would let them have that extra amount, after all we don't know how much they take when breastfeeding.
I'm so sorry that this is so long, but if you are reading this you have presumably managed to get through it. I hope that I haven't given you any actual bad advice OP, but if you are in any doubt then please check with the health medic that you get on with, and trust, the most. Also, if any Mumsnetters can have been bothered to read all of this, then I am sure they will point out any, and all, faults. Do please listen to them, and although I don't think that babies have changed much in the last 40 odd years, safe practices certainly have!
Oops, one last thing you might think I have missed out on as a priority, which is the love babies both need and deserve. I think that your OP Jennifer showed us all very definitely that you love your baby very much, and that you wouldn't have all the concerns you do have if you didn't love your sweet baby. But, the other reason I didn't put love down as a priority, was because not all babies are lucky enough to be born into a loving environment, for all sorts of reasons, including the poor mum having acute postnatal depression. So, I still advocate that at the beginning of a baby's life, the first 3 things I spoke of, are still the most important. I want to give you flowers Jennifer, but I don't think they will help, so instead I am sending you a Big Hug, which probably won't help either, but I can't think of anything else, except thank you from me, and the village, for being such a great Mum 🤗 xxx