Alish, sounds like your little girl is doing well so far. Good to hear!
Being a mum is pretty tough - be kind to yourself. We all feel vulnerable adn unsure of ourselves to begin with. As you find your feet - through trial and error and generally muddling through - your confidence will build.

Do you want to exclusively breastfeed? If so, you will need to get more milk out of your breasts (and into baby). That means either feeding more often or expressing (60ml is a pretty decent haul, btw). It doesn't sound like you're using that much formula at the moment, so it's probably quite possible if that's what you want to do. Otherwise you can always just continue as you are and see how you go.

Just a general comment (and won't necessarily realte to your baby Alish), but some babies are very sleepy and don't demand much. They seem like little angels, sleeping and hardly fussing, but they don't feed often enough. Mum doesn't establish a good supply. The weight gains taper off and in time that baby can be in real trouble. It does happen. *Usually* we can follow baby's lead and feed on demand, but sometimes that system does need a little tweaking early on, which is why the nurses and midwives bang on about demand feeding, weight gains, numbers of pooy nappies and 8-12 feeds in 24 hours and so on.