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.
There is a range of expected ages within which your child will typically develop new skills. He will most likely be walking well on his own between by the time he is 15 months old and will learn to walk backwards and up steps between 16 and 18 months. A few months later he will be able to kick a ball and jump in place.