It took DS 2 weeks before he could latch on properly. At first he couldn't latch on/suck the nipple at all, the paed had missed his tongue tie (saw a specialist and had it confirmed snipped at 1 week, then he could latch on for short periods before sliding back into a shallow latch). I went to a breastfeeding clinic when I was visiting family (we don't have one in my area) when he was about two weeks and they really helped us perfect his latch and since then we never looked back!
I did come on MN for advice after his tt snip when he still wasn't latching on properly, and although I received some helpful/knowledgeable replies in my situation I really needed real life help by a BFing professional, which is what I finally got!
However, having read endless MN threads during pregnancy and knowing before hand about supply and demand, it taking a while for milk to come in and how unlikely it is for someone to properly not be able to breastfeed it gave me the confidence to keep giving him cup top ups of EBM, ignore bad advice and keep persevering with breastfeeding -
The hospital midwife refused to listen to me that I thought the paed had missed his tongue tie (which they definitely had, the specialist saw it straight away and found it was quite restrictive) and said that I would have to either stay in trying to (pointlessly) get him to latch or agree to top up with formula and leave. Well I agreed to top up with formula but then basically binned her plan as soon as I was out of the door (my community midwife agreed that this was a good idea). If I hadn't known that the amounts I was producing were completely normal for a bf baby I would probably have not managed to breastfeed in the end because my supply would have dropped right off since she gave me a plan to ff the full amount every 3 hours. I still get worked up about this when I think about it, and I feel really resentful that I had to give him some formula in hospital before she'd let me go, part of me wishes I'd just flounced out with him. Anyway, DS is now 7 weeks and has put on weight really well, he moved up a centile recently.
I have also never had the worry that a lot of women get at his growth spurts that I'm not producing enough because I had read about them before hand on MN.