A laughing baby in a walker.
A toddler laughing at funny faces.
The childs age is unknown and we don't know that the laughing is at funny faces.
exists e1 x1 x2.(a_topic(x1) & in(x1,x2) & n_walker(x2) & n_baby(x1) & Actor(e1,x1) & v_laugh(e1))
exists e1 s1 x1 x2 x3.(a_topic(x1) & at(e1,x3) & n_face(x3) & a_funny(s1) & Theme(s1,x3) & Actor(e1,x2) & v_laugh(e1) & (x1 = x2) & n_toddler(x1))