Like others here, people gave me advice. I would nod, smile, thank them and then go home and make my own mind up.
Very permy point: observation is key. (And because of that, parents will know their baby best.) Spot patterns in routine and behaviour - which may take some weeks to emerge, and will shift every once in a while.
Food: when there's a quiet moment, prep your next meal(s), even to the point of making a sandwich and putting it in the fridge hours ahead, and keeping the biscuits out next to the kettle. Things can get hectic and everyone copes better with regular feeding.