Genetics and Child Characteristics

When a couple waits for their baby, they try to visualize the characteristics and traits that their baby may have. They try to picture how their baby will resemble.

Will the baby be tall like the dad? What will be the gender of the baby? What will be the height? What will be the hair color?

Such questions arise in the mind of every couple waiting for their baby to arrive in this world. Experts have done extensive research to find the answers to such questions.

Researchers have found that there are almost 60,000 to 100,000 genes in the human being chromosomes that are 46 in number. These genes are made up of DNA. The research has highlighted that a baby gets 23 chromosomes from the mother and 23 chromosomes from the dad.

One couple of parents have the probability to produce 64 trillion children entirely different from one another. This fact is proof that it is highly difficult to figure out how the baby expected to be born will look like. But there are a few traits that a baby gets from the father and some from the mother.


Gender of the Baby

The gender of the baby is determined by the men. It is based on whether the semen is carrying the X chromosome or the Y chromosome.

When the semen is having the X chromosome, it combines with the female X chromosome making a girl. When the semen is having the Y chromosome, it associates with the female X chromosome making a boy.

So, the gender of the baby is determined by the father instead of the mother.

boy or girl baby gender
Credits: Freepik

Eye Colour

A Baby’s eye color is also one of the greatest predictors of a child’s health. The pale-colored eyes are the sign that the baby has some health issues and needs to be consulted with the doctor.

Eye color is assessed by the variation of genes determined at the time of production of pigments i.e. melanin, pheomelanin, and eumelanin. Every single gene has two dissimilar versions. The baby gets one from the father and one from the mother. If both the versions are the same, the eye color of the baby remains common for both of the parents. If both the versions are different then the dominant one appears in the baby.

Brown color is considered to be a leading trait and blue eye color is considered to be a receding trait. While the green eye color is considered to be a mixture of both. While comparing, the green eye color is considered recessive to brown color but dominant to blue.

baby eye colour brown eyes
Credits: Freepik

Body Features

There are certain facial features such as dimples, finger shape, and eyebrows that run down from generation to generation. Patterns of fingerprints also run in family. Some studies have claimed that Jaw shape and crooked teeth can also be inherited genetically.

Some people have ‘Gap tooth’. Studies claim that these gaps are also inherited genetically. Some people say these features of the baby can be determined by looking at the pictures of the family. These are like generational patterns that keep on repeating from one generation to another.

Some families have strong chins, while some have round faces. These are the traits that pass on in the newly born.

Dominant Hand

It is considered that if both the parents are left-handed, there are strong chances that the baby will be lefty as well. But if only the mother is left-handed, there are still high chances of the baby being left-handed.

writing hand children dominant hand
Credits: Freepik

Intelligence (IQ)

A new study has highlighted that intelligence is determined by two X chromosomes from the mother and one from the father. This possibly could affect the baby’s level of intelligence.

Another study has depicted that the IQ level of the mother is also a strong indicator to determine the IQ of the baby. There are high chances that the IQ level of the baby resembles that of the IQ level of the mother.

Sleeping Style

A research study has found out that the sleeping patterns and styles of the baby resemble with mother’s sleeping styles and patterns. Some mothers face insomnia while others are huge fans of long and uninterrupted naps. Whatever the category of the mother is, the baby is most likely to follow that.

The baby generally follows the sleeping patterns of the mother and it eventually becomes his or her lifetime sleeping habits.


There are almost 700 genetic variations that determine the height of the baby. But studies have shown that fathers play a major role in the department of height. Insulin-like growth factors are measured while assessing the tilt of the baby’s height towards the mother of the father’s side.

It is seen that the father’s growth factor, also known as IGF, helps the growth of the child.

siblings checking height child
Credits: Freepik

Mental Disorders

If a man becomes a father at an old age, he is more likely to pass distorted genes to his child causing various mental health issues among the child.

Research has shown that in such conditions the child can develop disorders like bipolar or hyperactivity. If the parents are above 45 then their newly born can also face issues such as learning problems and in extreme cases, suicidal inclinations.


A child’s characteristics and traits are the combinations of both mother and father. A child inherits some features from the mother while some from the father. Height is usually determined by the father while intelligence is inherited from the mother.

DNA plays a very profound role in depicting the characteristics a baby may display. Behaviors of the parents are passed on to their little one that becomes their little version as well.

There is also a debate of nature vs nurture. Undoubtedly, the environment and the surroundings play their part but it will be wrong to neglect the huge impact that genetics play in the makeup of the child. Genetically, a baby carries more mother genes as compared to father genes but it is impossible to neglect the impact of any of them.


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