My lo is almost 21 weeks and she has the same problem. She likes to hold toys in her hands and put them in her mouth but when she drops them (which is still a lot), she doesn't know that they're right next to her and so she gets mad. She also gets bored easily. So most of her activity time is spent with me entertaining her or holding her toys so she can hit them and take them. Tracy said to not let them get dependent on us and that by this age, they should play about 15 minutes alone. But she is bored within 5 minutes. She also hates lying on her back for more than a few minutes. She struggles to sit up so the playmats don't work.