A baby playing in the tub.
A toddler taking a bath.
Not all babies are toddler age.  The fact that one is in the tub does not mean one is taking a bath.
exists x1 x2 x3.(n_tub(x3) & a_topic(x1) & in(x1,x3) & n_playing(x1) & of(x1,x2) & n_baby(x2))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_take(e1) & n_bath(x3) & (x1 = x2) & n_toddler(x1))