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!



  • Wow….what an irrelevant and inconclusive study…..
    That’s like me saying the sex of your baby will have a small impact on their hand preference….


  • I find this research quite weird. My husband is left handed and he was breastfed. My daughter is right handed and she was breastfed. I am like my daughter.


  • I dont think its really matter


  • I feel like nurture is a very big influence on most traits


  • So the study shows 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….what a useless finding ! And no the study doesn’t hold up in our family.


  • I was breastfed and am left-handed. I mixed-fed my twins from day one and they are right-handed, whereas my 3rd and 4th children were breastfed for a bit longer and are both left-handed! What a waste of time and money this research has been.


  • Bottle fed my first born and she’s m right handed. Breastfed my 2nd til 14 months and she’s ambidextrous.
    It’s all a load of hogwash.


  • I breastfed all 3 of my boys, and the first 2 are left handed.


  • It’s an interesting topic and debate, not sure if I believe it


  • I do not believe in this as it does not make sense for my children, husband or me. I was BF to nine months, left handed. My husband was tubed feed right handed. Four of my children were breast fed to about the 6-13 months age all right handed. Two children bottled feed from birth (twins, older mum) right handed.
    One who was BF to 13 months was I think determined to be Right handed as he damaged his hand about 26 months of age. He would not let that stop him being right handed as would use left handed only until his right hand was able to be rested. Just after he turned 5 he was using his right hand for everything, proving his specialist wrong in that he would never use his hand again.


  • Wow that’s new to me… Interesting read


  • Golly, what will they come up with next. There is not one left handed person in our family (that’s our immediate family, our parents and siblings) and we were all fed differently.


  • I have 4 kids, all fed the same way only one lefty out of them all


  • I don’t think genetics have anything to do with it now how they are fed. My husband and I are both right handed and my son is left handed. I have a friend who is left handed along with her husband, both her kids are right handed.


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


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