Heyy, honestly for a baby yang baru 34 hari old, it's better to avoid boiled water for now even just to rinse the mouth, at this stage dia still needs breast milk or formula lang, and their tiny tummy is still adjusting to digestion. A few of us mums learned this the hard way! Best to check with your pediatrician first, especially since setiap baby berbeza, tapi most doctors akan suggest waiting until baby is around 6 months before introducing any water. Kalau worried about milk residue, you can gently wipe gums with a clean, damp cloth ja if you want, tapi susu itself is dah cukup bagus untuk baby at this stage.