My son is 16weeks old and he is not really showing any interest in his jumperoo. I am afraid I am not entertaining him enough and if he is bored all day. I usually put him on his playmats (he has two different playmats) and I got him a jumperoo two weeks ago but he doesn't really play with it. I let him sit but he doesn't jump or he doesn't really grab anything on the jumperoo. Also he hasn't been able to roll yet. I am getting worried if his development is not on the right track.