
Share
3rd February 2018
09:00am GMT

The other way to tell? Simple genetics.
It may seem obvious but according to the US Fetal Medicine Foundation, a baby is significantly more likely to be born with a big head if one or both of their parents has a big head.
It's worth noting that a big head, also called macrocephaly, may be a little sorer for Mum, but it doesn't necessarily mean health problems for your baby.
It could even be a good thing - a study by scientists at UK Biobank found that head circumference and larger brains are now proven to be associated with superior intelligence.
Just one in every 100 babies is born with a bigger-than-average head so it's not too likely that you'll be affected.
Explore more on these topics: