Thank you all - that puts my mind at rest!
You are right Dani - I am a bit stressed about it all at the moment. Even though I fed Rory, at this age he was in SCBU so I pumped, and I also pumped at this stage for Ethan as he never latched. I've never experienced a well baby breastfeeding at this stage, so it's really new to me. I keep worrying over whether he's taking enough, if he's sleeping too much, whether I should be waking him, whether I've got enough milk, and so on...
FC I'll start to relax about it all. I think what's throwing me right now is that even thought at times Jake is really settled and sleeps well, at other times he's really fussy and I can't get him to come off without him waking up and looking for it again frantically. I think that at those times a lot of it is for comfort, but because I'm so new at this I'm worrying that he's hungry.