DD is almost 8 weeks and previously i've been waking her up around 3-3.5 hours to eat during the day to make sure she's getting enough. now there is only one nap per day where she is sleeping after 3.5 hours, so i'm wondering if i should wake her at 3.5 hours to eat or let her sleep however much she needs?

ETA: i mean during the day! i let her sleep as long as she wants at night!

what did/do you do?