A 4-day old baby has fed 5-6 times and has urinated 3 times…

A 4-day old baby has fed 5-6 times and has urinated 3 times in the last 24 hours. The last stool was 2 days ago and green. The mother reports the baby sleeps a lot, but has “a bit of yellow on his face and tummy.” The provider should advise the woman to: