He doesn't move much

Adryanna
33 weeks and a day. Baby boy doesn't move very much, esp here lately. He still noves but the whole 10 kicks in two hrs thing, he doesn't do that. Its more like shifting every 4-5 hrs maybe. Should i be concerned? Before he moved head down he was very active, has anybody else been experiencing a generally lazy baby? Im a ftm if that wasn't already obvious.