Is an outward curvature in the spine?a two year old normal?

Posibly: If it is new get it checked may be a congenital kyphosis developing noticed now after a little growth child's spines are different shaped usually gently kyphotic haven't walked enough to develop the balanced curves.

Hard to answer: There are two areas where the spine curves naturally,There is a frontward bowing just below the head and another just above the pelvis.The natural neck bowing is countered by a backward ridging effect over the base of the neck and upper shoulders.There is no natural side to side curve. Since you are vague on location only a generic description of normal is possible.