I know most people are having problems with bubs going to sleep and staying asleep however can a baby have too much sleep??

My DD is almost 3 months old is fully formula fed and is sleeping brilliantly. I am worried howevere that she is sleeping too much and not having enough awake time.
She will have 12hours most nights occaisionally will wake overnight for a feed but will be awake less than an hour, she will have two day sleeps one of about 3hours another of about two and then a nap before going down for the night again.

She is starting to sleep later and later in the morning and I am not sure whether I should be waking her. I have just let her do what she wants to do so far and she is so content. We are lucky enough to have great support from my Mum and MIL so they stay with my two children while I do the kinder run etc

Am I just worried over nothing?
I am very grateful that she is sleeping so well
Sue