Moms with newborns

I have a 2 week old bby girl and I'm concerned about her dirty diapers. She is breastfeed and her first diapers were seedy like and now they are very watery. She's been fussy and looks like she's in pain when she has a BM. Also her vomiting is light yellow. Wondering if this is normal. Her pediatrician said to keep an eye on her vomits... If it turns bright yellow or green. Its not bright yellow but light yellow. What do you think. Sorry for the TMI pic... But is it normal? Her BM soak right in the diaper.