Birth order affects favoritism.
This is a fact!
Some parents may have a favorite based on birth order. For example, parents commonly prefer the youngest child of the family, especially because the family “baby” tends to be more laid-back and may attract attention by crying or being cute. After all, the parents usually raise the youngest child in a more relaxed manner, and the “baby” often uses charm and appeals to parents’ protective instincts in order to compete with older siblings.
So what does this mean to parents? On the one hand, it means that parents who have favorite children are in good company. On the other hand, it means that children who accuse their parents of showing favoritism may be right.