premise: A toddler in a blue one-piece plays with a stack of plastic tubs, while toys are scattered on the floor behind him.
hypothesis: The baby is playing with things on the floor.
explanation_1: A toddler can also be called a baby and toys are things
explanation_2: Answer; Baby  is the toddler and he is playing
explanation_3: Babies play with toys and since the can't walk they typically crawl around on the floor.
premise_logic: exists p1 p2 p3 s1 s2 x1 x2 x3 x4 x5 x7.(n_male(x7) & n_floor(x7) & rel(p1,x1) & in(x1,x2) & with(x2,x3) & of(x3,x4) & n_tub(x4) & of(x4,x5) & n_plastic(x5) & n_stack(x3) & n_play(x2) & a_one-piece(s2) & Theme(s2,x2) & a_blue(s1) & Theme(s1,x2) & n_toddler(x1) & exists x8.n_event(x8) & exists e1 x6.(behind(e1,x7) & on(e1,x7) & Theme(e1,x6) & v_scatter(e1) & n_toy(x6)) & while(p2,p3))
hypothesis_logic: exists e1 x1 x2 x3.(n_floor(x3) & n_baby(x1) & on(e1,x3) & with(e1,x2) & n_thing(x2) & Actor(e1,x1) & v_play(e1))