Small red bumps on the face of a 1 month old baby could be baby acne. Baby acne mostly occurs in the newborn stage, or in babies born shortly after birth, due to the fact that the androgens in the body do not drop in time, or metabolize and excrete in time. It may stimulate an inflammatory response in the hair follicles and sebaceous glands of the face, hence the appearance of baby acne. However, these baby acne, as the baby grows older, usually will gradually gradually subside, so do not worry too much. Pimples and papules on the face are caused by allergies or a poor diet.