Helmets for toddlers with hydrocephalus (encephalus,cephalus)
Summary: Finding a helmet for a child with hydrocephalus is not just a simple matter of finding one large enough. You
probably know that already.
A number of disorders, primarily hydrocephalus, can cause children to have larger than average heads at a very young age.
Hydrocephalus is sometimes known as "water on the brain" and is a buildup of cerebrospinal fluid in the brain. There
often are other complications, including motor disabilities and other disorders. If you are not familiar with the
disorder, here is a Google search on
Parents of children with hydrocephalus contact us looking for a helmet for their child, having found that normal toddler
helmets are much too small, and in some cases even adult helmets are not large enough to fit. But fit is only one
First, you should be aware that wearing a bike helmet will not necessarily protect any rider from an injury. Bike helmets
are designed to protect the average brain against catastrophic injury. In a hard knock they do not attempt to soak up all
of the energy, since no helmet with reasonable thickness can do that. It is not unusual for a person with a normal brain
to experience a concussion and be knocked out during a bike crash with a helmet on. A person with a brain affected by
hydrocephalus and perhaps associated disorders may have a much worse outcome. Only your medical support team can tell you
about that for your child, and you will of course want to ask them if you have not already done so.
We are not aware of any extra-extra-large toddler helmets on the market, and no helmet specifically designed for riders
with hydrocephalus. Manufacturers are always concerned about lawsuits if the helmet made it appear safe for a child with
hydrocephalus to ride, and then the child were injured or killed.
The best advice we can offer is to always to ask your pediatrician for advice before putting a helmet on your child. If
you get the green light from your physician, you may have to use an adult helmet to find one that fits. The only
difference defined by US standards between the protection of an adult helmet and a toddler helmet is that the CPSC
standard requires more head coverage for toddlers under five, so toddler helmets come further down on the head. If a
normal adult helmet is still too small, see our page on helmets for big heads
If the physician confirms that biking is ok for your child, the best helmet for a child with hydrocephalus would probably
be one with a round, smooth exterior and a thicker, moderately dense foam liner. You generally find helmets like that in
discount stores at low prices (under $30), not in bike stores at prices above $100. Do not spend more on a super-vented,
fashionable helmet, since it will have harder foam to make up for those vents.
Fitting a child with hydrocephalus is not necessarily just a question of getting a helmet with the right head
circumference, since the child's head shape may differ from an adult head. If a helmet with a sizing ring ("one size fits
all") does not give a good fit, you may have to find another model that uses fit pads instead of the ring. Those usually
permit using a thinner pad on the sides and thicker pads at the front and back to accommodate a rounder head, or the
other way around for a longer head.
Helmets are not magic, and they may or may not work for your child. Only your physician can say for sure.