When dealing with a headache, try boiling one cup of apple cider vinegar and one cup of water in a pot. Pour into a heat proof bowl and put on the table or other safe place that you can lean over the bowl and cover your head with a towel. Inhale the steam for a few minutes to bring some relief.
The warning on mine says not to use prior to 4 months of age. My son was in his Jolly Jumper from 3 months. The directions of use are that if they can confidently hold up their head then they are fine.
1 Pedaling a tricycle (at 3 years); becoming able to steer well at around age 4. 2  Hopping on 1 foot (at around 4 years), and later balancing on 1 foot for up to 5 seconds.  Doing a heel-to-toe walk (at around age 5)