Hi first time mum here, my DD Is just over 3 months old, she likes to look at picture books and time on her baby gym but I read that they can easily over stimulate, so I've tried to cut down a little on how much we do but then I feel horrible at times when she's in her chair feeling like I'm ignoring her even though I do talk to her, is there a set amount of time each day for stimulating activities? TIA