Pampers Premium Baby Diaper Pants in Small size can generally be used for infants, but for a 45-day-old baby, using the "New Born" size is usually more appropriate to ensure a gentle fit and prevent leakage.

🩺 Recommendations

• Choose the "New Born" size diapers for a baby this young to ensure comfort and proper fit.
• Monitor the baby's skin for any signs of irritation or rash when trying a new diaper brand or size.
• Consult a pediatrician if you notice persistent skin issues or discomfort.

🩺 When to See Doctor

Seek medical advice if the baby shows redness, swelling, or a rash that doesn’t improve with diaper changes or creams.

For personalized guidance, it is best to check with a pediatrician.