Barf and Poop

Brittany

1 week 6 days old did a huge barf last night around midnight but no fever. Last Thursday she went back into the hospital for jaundice and dehydration. She had 1 poop and a skid mark since 8pm last night and its now noon here. I feel like she should have more poops by now but seems like she is pushing and nothing is coming out. Should I be worried about lack of poops? Get gas drops? What is gripe water?