How big is the boil?
Since when has it been there?
Is there any discharge or bleeding?

Homoeopathic prescription:
Silicea 30 is a wonderful homoeopathic remedy for boils, pimples, and pustules.
Give your baby 5 pills every hour.
Silicea brings about quick suppuration and discharge of the pus. It checks infection, prevents further boils from coming up, and ameliorates the pain.

Along with the medicine, follow a few dietary guidelines:
o Give the baby plenty of water and fluids (milk, buttermilk, juices, and soups) to flush the entire system.
o Grate 1 clove of garlic, mix it with honey, to make it palatable and give him once a day.

Other recommendation:
Hot water fomentation should be resorted to several times a day. It hastens suppuration and eases pain.
Also, maintain good hygiene and wash the area well with an anti-septic.