Traits babies inherit: What will be my baby's eye colour? I am blonde, will my son have blonde hair too? Learn more about how your future baby will look like.
Every expectant parent has considered at least once what their baby is
going to look like. Some of us will have thought about it several thousand
times. It is something that will even cross a lot of people’s minds when they pair
up for the first time, no matter how many years away from actually procreating
they might be.
Think about it; you just knew when Brangelina started having babies
that they were going to be pretty much the best looking babies ever created,
didn’t you. And you knew that Will and Kate were going to give birth to
stunners, and you were right. How did you know? Genetics that’s how.
Here’s some slightly scientifically based information on how genetics
When a mummy and a daddy love each other very much their genetic
material combines to create a baby. This little bundle of joy will be born and
will grow up to show characteristics of both parents’ genes and bloodlines. Genes
come in pairs, and some genetic material is naturally dominant over others,
which means that some traits are more likely to show up than others. The
secondary gene is called the recessive gene.
Genes are set at the time of conception, so at this time your baby’s
eye colour, hair colour and other traits inherited from the parents are already
A dominant gene will override a recessive gene, whereas traits from a
recessive gene will only show up if both genes in the pair are recessive. Sometimes
the baby will have strong traits that can’t be explained at face value, and
don’t seem to come from either parent, and actually may come from way back in
his genetic make-up.
Studies show that there are over 60,000 different genes in each human
being, which means that one pair of parents could produce over 60 trillion
possible combinations of a baby, so while you can guess how your baby will turn
out, your guess might not be right.
There are cool apps that you can check out like Baby Maker or Make Me
Babies which can combine photos of you and your partner and produce a really
weird looking picture of a baby which may (but probably won’t) be what your
baby will end up looking like. These apps are fun (try combining yourself and
George Clooney to check out your offspring; you know you want to), but for a
better idea of what your baby might turn out like, consider some of the
With eye colour, brown is the dominant gene, which means that if you
have brown eyes and your husband has blue, the baby is more likely to have
brown eyes. It doesn’t mean that your baby won’t have blue eyes, as the genetic
material determining eye colour is more complicated than this and takes into
consideration how many grandparents had blue eyes and what exact genes show up
on the eye-colour pair. But odds are that your baby has a greater chance of
being a brown-eyed little poppet.
Eye colour as a trait is polygenic, which means it is determined not by
just one gene, but by the combination of several. Think of it like this: the
mother has a pair of eye-colour genes and the father has a pair of eye-colour
genes, and the baby will have a pair of eye-colour genes which will be some
combination of the parents’ four, depending on what dominates.
Green is also a dominant gene, so more likely than not will override
the blue-eyed gene. Remember though this is just a prediction and will depend
on the overall percentage of genes that the baby inherits. For a hint of what
might happen though, check out the chart below:
What hair colour is more likely to be passed on then?
Darker hair genes will generally override the fairer ones, but again
it’s all a question of percentages. It’s also a matter of shades; the lighter
the brown of the genes, the less likely the child is to have dark hair, but it
all depends on how much pigment is actually passed on to the baby. Hair is a
bit more complicated than eyes however, as hair will change colour a number of
times across a person’s life. Red hair is also in the middle; it is a more
dominant gene than blonde hair, but not as much as dark.
Have we lost you yet? Basically you cannot say anything for certainty,
just predict with some idea of the odds. If you are pregnant, you need to take
into account both of your parents’ hair colour, plus both of your partner’s
parents’ hair colours, and you can take an educated guess at what your baby’s
hair colour will be.
What about curly hair versus straight hair; what is more likely to
dominate here? Curly hair is more likely to dominate as it turns out, however
if there are curly and straight haired genes in a baby’s mix then he could have
curly hair, straight hair, or anywhere in between. It can’t be generally
predicted unless all of the baby’s background is one way or another.
With height you can make a slightly more mathematical guess. If both
parents are tall, the baby will most likely be tall, and if both parents are
short, again the baby will most likely be short. If one parent is tall and one
short, the baby will generally grow up be an average of the two. You take the
average of the parents’ heights, and then add two inches for a boy, subtract
two inches if the baby is a girl and you may have an idea of their height.
Weight is also dictated to an extent by genetics, but most of what will
indicate how much your child will weigh depends on the environment in which
they are raised. If both parents are overweight then the child is more likely
to grow up overweight, particularly if obesity is dominant within the parents’
race.If both parents are very slim, the children will be slim. The child’s
weight may be predicted because of his genetic make-up, because of his
environment and his parents’ eating habits, or a combination of all of this.
If the weight of the parent’s differs greatly the best way to guess a
baby’s likely adult weight is to look at what weight the parents were
genetically, not the weight they are as adults, which is more likely to be the
cause of their environment.
Some physical traits dominate over others. The best way to predict what
facial characteristics your baby will have will be to look through photos of
his direct ancestors. Things such as shape and symmetry of face, hairline
features such as cowlicks and widow’s peaks, gaps in teeth and quirks such as
dimples get passed on to your babies depending on how many ancestors have these
Whether or not your baby will be right or left handed is also
determined genetically. The right-handed gene is dominant, which is why there
are more right-handed people in the world. If any of your grandparents are
right handed, it is more likely to have been passed on to you. If you are right
handed and your partner is left handed and you have four children, one out of
the four will probably be left-handed. Again this is a probability only.
Skin colour, like hair colour, is another really hard one to predict,
as it works in shades. Chances are your baby will be some combination of your
and your partner’s skin tones, but could basically be anywhere in between. It
could also be something completely out of the blue (it probably won’t actually
be blue however).
There are genes that skip a generation and also genetic mutations, so
anything could happen and surprises could be in store; for instance a child of
dark-skinned parents could be born with very pale skin. Even non-identical
twins can be born with completely different skin tone to each other.
So if you
still have no idea…
In conclusion, there is really no way to predict what your baby will
look like exactly. All you can do is make intelligent guesses. Most likely he
will be a blend of the parents.
A really good approach is that you could just keep on believing that he
is going to turn out like George Clooney (for any mother, their child is the
most beautiful thing in the world anyway!)
In the end it doesn’t really matter; the only thing you can predict for
sure is that you will completely love your baby, no matter who he looks more
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