My lo is just over 8 weeks. I would say she's spirited mostly and therefore tends to get overtired quickly, just as yours I take it. The amount of A time sounds about right from my experience and from others' posts on here. Mine will also only tolerate maximum 2-3 minutes under her gym, 30 seconds tummy time, and maybe 20 minutes of light activity e.g. walking around, sitting on my lap, occasionally watching baby einsteins, etc. I usually act on the first tired sign, be it yawn, seeming disinterested, rubbing her face, etc and put her down to sleep then. Hope that helps.