If you’re feeding your baby formula, you should be boiling the water for his bottles until at least six months of age. That’s to prevent the risk of bacterial infections from tap water.
After six months, it’s okay to use water straight from the tap, or you could choose to filter it. If you opt for the latter however, remember that filtered water needs to be kept in the fridge, as most filters also remove some of the chlorine that keeps tap water safe.
If you’re travelling in an area where the water supply is suspect, then it’s best to use bottled water, or boiled water for your baby’s bottles. There may be bacteria in the water that can cause upset stomachs, which is harmful for your baby.
If you’re thinking about using water from your own well, it’s worth having it checked before your baby arrives, to make sure it’s safe, and if your water comes from a private supply, or you’re unsure if it’s safe, it’s best to use bottled water too. Some water supplies contain high levels of nitrates that are potentially harmful to your child (boiling water won’t remove chemicals).