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.
my used to swing and bouncer at the age of 6-7months . swing - birth- 4 months jumperoo - 3-6months she could crawl at 6 months and so then refused to be put in something where she couldnt be mobile anymore so then the jumper went lol.