It turns out being breastfed or bottle fed can determine whether your baby will be right or left handed.

The debate over breastfeeding vs bottle feeding never seems to end, and frankly we think it’s a completely personal decision, but the choice you make could have an interesting consequence.  A recent University of Washington study discovered a link between the way a baby is fed and whether they turn out to be right or left handed.

Nature vs Nuture

Even though the hand you write with is largely affected by genetics, there is also an element of nurture in determining the final outcome. The study found that being left handed was more common amongst children who were not breastfed. “We think breastfeeding optimises the process the brain undergoes when solidifying handedness,” the study’s author Phillippe Hujoel said. “The critical age window for establishing hemispheric dominance in handedness includes the first nine months of infancy and is in part determined by nurture.” We have to say we’re a little sceptical.

Does It Matter?

The study acknowledges that the method of feeding may only have a minimal impact on the hand that a child eventually ends up writing with, with initial hand preference not always indicative of the final outcome. It also suggested that the length of time that a child is breastfed for is an important factor. “It provides an independent line of evidence that breastfeeding may need to last six to nine months,” Professor Hujoel said.

So does it really matter what hand your child writes with? And does the way you feed them really have any ability to alter their preference? Who knows, but we think most mums have other concerns when it comes to choosing the best option!

Do the findings of the study hold up in your family? Tell us in the comments!




  • Both my brother and I were breastfeed and he is left handed and I am ambidextrous.
    Load of hogwash.


  • Absolutely a load of rubbish.
    Both my kids breastfeed for 11-12 months and one is ambidextrous and the other very much left handed, just like his dad and poppy
    I think it’s got way more to do with genetics


  • Not sure about this research! Doesn’t seem to hold true in my family.


  • My son was breastfed until he was 2. He is a lefty. My husband and I are both right handed. Our daughter is too young to have a preference yet.


  • I breast fed all of mine and of my biological kids I have one lefty and 2 righties, the fourth doesn’t have a preference yet


  • I breastfed all mine and the one who breastfed the longest is the only left-handed one!


  • Two of my three kids were bottle fed and both are right handed and my other one was breastfed and is mainly right handed but broke his right arm when he was 5 and have to use his left arm he still use his left form time to time for some things


  • Mine were both bottle fed and both are right handed.


  • Don’t think this one has much substance.


  • I’ve breastfed all my babies and managed to get a lefty


  • I dont think this study holds much value.


  • The main reason that it matters to be right handed over left handed is because nearly everything is geared up for right handed people.


  • My husband was breastfed and is left handed his brother wasn’t and is right handed.


  • Totally inaccurate if you look at my three kids – left handed and right handed, and all breast fed.


  • Interesting study, but I wonder just how accurate it is? My son is favoring right hand so far and was breastfed, so it seems right for us so far, but I am sure there are people who werent breastfed who are right handed or vice versa


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