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.
Baby exercise jumpers (jolly jumpers) A baby exercise jumper (sometimes called a jolly jumper) is a suspended sling-style seat hanging from a spring and/or rubber cable that is clamped above a door architrave. It is designed to support a baby, who is not yet ready to stand, in a semi-standing position with the baby's feet touching the floor.