What determines whether a newborn baby has double eyelids?

Generally speaking, when a baby is just born, it is not certain whether he has single eyelids or double eyelids. Some babies have single eyelids when they are born, but they become double eyelids after a while. Some children with single eyelids even develop double eyelids when they are five or six years old. Can single or double eyelids really change freely? What determines whether a newborn has single or double eyelids?

1. Whether a baby has single or double eyelids is determined by the genes of the parents

Biology believes that double eyelids are absolutely dominant, while single eyelids are recessive, so the genetic factors of double eyelids are more likely to show up on the surface of every baby.

If both parents have single eyelids, the child will generally also have single eyelids.

If both parents have double eyelids, generally speaking, the child should also have double eyelids, but occasionally the child may have single eyelids. The reason for this situation is because it involves the issue of dominant genes and recessive genes, which is the same as when a couple with type A and type B blood give birth to a child with type O blood.

In other words, even though both parents have double eyelids, they both carry the genetic genes for single eyelids. When the single eyelid genetic factors from both parties pair up, the child will also have single eyelids.

2. Double eyelids are "absolutely" inherited

As long as the child's father has double eyelids, it is almost 100% guaranteed to be passed on to his children. These babies have obvious single eyelids when they are born, but as they grow up they will develop double eyelids like their father.

In addition, some mothers are confused. Their baby's eyes are single eyelids for a while, but they become double eyelids after a while. What is the reason for this?

There are many reasons for this, such as illness, bad sleeping habits, etc. New mothers don’t need to worry too much, as whether the eyelids are single or double is determined by genes.

Therefore, if the father has double eyelids, it can almost be determined that the baby will also have double eyelids in the future, and mothers who like double eyelids can rest assured. Whether a child has single or double eyelids is actually determined by genes, and will gradually take shape as the child grows up. In fact, the neonatal period is still unstable, and if the newborn has double eyelids, it will gradually show up as the baby grows.