Hi, My baby boy is one month old now. Doctor advised to use dexolac 1 when there is insufficient breast milk. We are using it only once in a day and breast milk all other times. Today I saw a label on the packet stating that "if opened use within 21 days". But we cannot complete the packet within that time as we are using only once in a day. I just wanted to know if we can use t after 21 days of ignoring the statement as the powder will be wasted.