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.
Many bouncers can only be used for the first six months or so of your little one's life. They're no longer safe once your baby weighs 25 pounds or can sit up independently, a milestone that usually happens between 4 and 7 months. But some models can be used for older babies and toddlers up to 28 or even 40 pounds.