LO has started to sleep better, and we're getting on a schedule. today she's slept longer than usual (she's ebf). Starting last night she slept 6 hours straight, and then today she's going on 4 and a half hours for a nap. Is this okay? Should I be worried? She poops and pees fine, eats well, and behaves normal. Maybe a growth spurt? How long is too long a daytime nap?