How much active playing do you do with your LO? I try to spend as much of the day as possible playing with my DS, talking to him and reading to him. There are parts of the day where I sit him on his play mat and surround him with toys to entertain himself for a bit, and then I start to feel guilty. There's also some YouTube nursery rhyme videos that he really enjoys and I'll stick those on once or twice a day for him and sing along with him or pop him in his bouncer.
I find it's so exhausting to be constantly entertaining. He has two naps a day, but they're only short and usually on me. It's tiring being a mummy, isn't it?