Specifically designed to be used with Milton Mini Sterilising Tablets, Germ Magnet, Germ Free, Ideal for travel, Sterilises in 15 mins, Stays sterile for 24H, Bisphenol A free, Cleans and sterilises on the go Parts Guide A - Adjustable travel strap B - Handle C - Top D - Sponge with hole E - Solid sponge F - Fill line G - Base Ask the experts Why should I sterilise? During your little one's first 12 months, their immune system is still developing so they need extra protection from germs that cause gastroenteritis and other nasty bugs. Until what age should I sterilise? Until your baby's first birthday. Did you know? At 6 months old, baby's immune system is at its weakest, and even at 1 year they will only have around 17% of adult immunity levels against the germs that cause diarrhoea and vomiting.