To start, we need a few details:

The 30 day tab should be used for those receiving both breast milk and formula

The 3-4 day tab should be used for those exclusively breastfed or exclusively formula fed in the first 3-4 days

Additional Measurement:

A time value is only required for the first 7 days

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What is it?

"Newt is the first tool that allows pediatric healthcare providers and parents to see how a newborn’s weight during the first days and weeks following childbirth compares with a large sample of newborns, which can help with early identification of weight loss and weight gain issues." Ian M. Paul, M.D., M.Sc.
Chief, Division of Academic General Pediatrics
Penn State Hershey Children’s Hospital