Very early in the maturation process, male and female human embryos are essentially the same. All these embryos have structures that will ultimately form the defining physical characteristics of male and female.
In the early stages of development, all embryos have both the Wolffian duct and the Mullerian ducts, for instance. Under the influence of a Y chromosome, the Wolffian system develops into the internal and external structures of male anatomy, and the Mullerian ducts regress. Conversely, in the absence of a Y chromosome, the Wolffian system regresses considerably, and the Mullerian system develops to its full potentials, forming many of the female anatomical structures.
It should be clarified, however, that embryos do not all start out female. The genetic makeup of each individual is in place from the time of fertilization. Thus, the programming for male and female is determined from the outset, and the anatomical gender is simply a result of the expression of those genes.
The mammary duct system and the associated nipple is likewise the same in both genders, developing during the sixth week. The rudimentary mammary duct system remains indistinguishable at birth. Male and female breast tissue remains poorly developed until influenced by estrogen in the early stages of puberty in the female.
Male nipples as vestigial organs
If male nipples are vestigial, they must have had a more robust function in the past. Does the evolutionist actually suggest that our male evolutionary ancestors breast-fed newborns, and that somehow as evolution progressed, this ability was lost? What is the evidence for this?
Male nipples as nascent organs
Do evolutionists have any explanation that fits their theory and is backed by the evidence?
Actually, evolution posits that mammals evolved from reptiles and that the divergence of male and female was already in place in reptiles. Why then would another divergence occur as humans began to evolve, since there were already male/female reptiles?
Far from being a problem for creationists, it is in fact, the evolutionists who have a problem with this issue, as they can provide no reason for the existence and persistence of male nipples in an evolutionary scenario. The creation model provides a far better explanation for the presence of nipples in males than any evolutionary model. Especially since the evolutionist never offers a theory for male nipples that is backed by the evidence.