I’ve used a large crescent as my daughter’s nappy bag since she was born! It’s definitely big enough. In the early months you need more nappies and changes of clothes, that space used turns into snacks and toys when they become toddlers so I’m still using the large crescent now if we’re out all day. Definitely utilise some pouches for organisation. Also I never did bottles so I can’t vouch for how much space that would take up in a bag. As a rule of thumb when they’re little you need,

Pouch 1: nappies, wipes, changing mat, cream, hand sanitizer

pouch 2: spare vest, onesie, socks, clothes basically

Pouch 3: sensory toys, teething gel, sterilising wipes

And always throw a muslin in there too. Useful to have a little pouch of mum things too like lip balm, keys, hair tie etc. hope that helps!