A 30 day old baby should take between 60mL-100mL of breastmilk, as the amount of breastmilk will vary with each baby’s food intake. The amount of breast milk a 30-day-old baby should eat should be between 60mL-100mL, because each baby’s appetite is different, the amount of milk will also be different, as long as it is within this range is normal. 30-day-old babies’ main nutrients are taken in through breast milk, and only when the breast milk is sufficient, the baby can get better growth and development. Therefore, breastfeeding mothers should eat more nutritious food, such as more protein and fiber food, to ensure their own nutrition, breast milk secretion will be sufficient. Normally, according to the weather changes, pay more attention to the baby to keep warm, you can give the baby to wear some breathable cotton clothes. When the weather is bad, try not to take the baby out to prevent the baby from getting sick.