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.
Babies develop at their own pace. Typically, they start cruising (holding onto furniture to walk sideways) from 8 - 12 months old, and start walking from 10 - 15 months. These ranges provide a guideline to baby's development. If your baby is delayed in achieving these basic motor milestones, consult your paediatrician or physiotherapist for advice.