Loads of info online but personally I wanted to because there's a shitload of genetic allergy issues in my family and dds dads and bf is believed to help with these.
She still has eczema & hay fever but she's not had an asthma attack in donkeys years and the eczema and hay fever are really very mild compared to how the rest of us are, she's also not had any of the other allergies.
I know I cannot know for certain how she'd have been if she'd not been bf but I do think it's made a difference.
As a mum I ended up doing both bf and bottle as my milk dried due to a medical issue before she was 1.
So I've done both - bf was SO much easier and way more convenient - and free!
My milk dried literally from normal supply at last feed to nothing! So we had to dash out and get everything for ff in one go and it cost a bloody fortune! Not least because it was trial and error on formula, bottles and teats until we hit the right combination for dd - not talking preference but first few formulas made her projectile vomit! She couldn't suck the silicon teats at all to get any milk out even fast flow ones - so we had stuff we bought that was only used once and at that point we didn't even know anyone we could give it to so it just got wasted!
I also really hated all the faff I'd washing and sterilising, measuring bloody scoops, having to gauge how long we could spend out of the house because bottles only last a few hours out the fridge even in specially insulated carriers. Whereas with bf could come and go as I wished, didn't need to remember to take stuff, or think where I was going in terms of facilities for warming bottles etc - hated all that it was a right pain in the arse!
Another thing I loved was that breast milk adjusts to your child's needs. Dd never had any tummy troubles while bf with formula even with the one she was best suited to we had regular bouts of constipation and bad wind to deal with. I very much noticed the difference when she was poorly with bugs she recovered far more quickly while being bf. Breast milk changes constitution according to babies health.
Ff is not awful but it's not ideal and it can never really replace bf completely.
Quite honestly for mums I think it's the mental attitude makes the difference.
I've noticed those that say "I'll try" are more likely to stop and quite early on too than those that definitely decide they ARE going to bf.
For me it didn't even occur to me to have ff stuff in I just had in my head I'd be bf.
It isn't easy at first, it's a new skill for you and baby to learn together, it takes time for your body to get used to it and it can be uncomfortable even painful in the first weeks and I think it's important to be honest about that. I honestly get annoyed at the "if you're doing it right it doesn't hurt" that's not true for everyone or even most!
Your nipples need to "toughen up" and getting the latch right takes practice.
Eg dd would only feed by turning her head to her right so a "normal" position on left boob but needed a rugby ball hold on right boob so she was kinda tucked under my arm - awkward madam!
But I'd definitely say - having done both - that bf is way easier, more convenient, flexible, cheap and really healthy.