When a baby develops flat head syndrome, or a flat spot on his head it is called plagiocephaly. This flat spot often develops when an infant spends too much time on his back or in “containers”.
Containers are items like swings, car seats, strollers, and bouncy seats. Putting your baby in a container is not necessarily bad and can be helpful when you need to put your baby down safely - you deserve that shower!
However, you do NOT want your baby to spend too much time in a container.
Flat head syndrome is not uncommon and often go away as a baby gets more mobile. However, if the spot gets too pronounced, a baby may require a helmet to help reshape the head.
If you notice a flat spot on your baby's head and are worried, make an appointment with your pediatrician.
If the spot forms on one side of the head, it can cause the baby to always have his head turned in one direction. This can cause neck tightness on one side and torticollis can develop.
For more details about torticollis, feel free to look at this post for information and ideas:
Your baby’s head may still rest on the lounger pillow, but he should be resting on a different part of the back of his head and with less pressure than laying flat.
5. Reclined on Parent’s Lap
Lay on your back with your knees bent. Let your baby lay with his back against your thighs and his legs and feet on your belly.
Again, his head may rest against your legs but he will resting on a different part of the back of his head with much less pressure than laying flat.
I do NOT recommend using infant seats
From a physical therapy and child development standpoint, I am not in favor of sitting a baby upright until they are strong enough to do it on their own.
It can put a lot of pressure on a baby's spine and takes away from his natural development.
I explain why I do not recommend propping babies up or using infant seats in this post: