#AskTheExpert Hello, my daughter is a preterm baby (born 32 weeks 6 days) and completes 30 days today. Her weight is 2.24 kgs as of 1 Jan '21. She's been prescribed Aptamil preterm formula. Till when should we continue this and when to switch on to Aptamil Phase I. We use the formula sparingly as we try to give her breast milk as much as possible.