Hi DD (9 months) has been unwell since Sat. She was clingy all day Sat and threw up just before bedtime on Sat night. Yesterday (Sun) and this morning she was better, not 100% but eating a bit and more perky. This afternoon she's taken a turn for the worse. She's been really clingy again and has thrown up three times in as many hours. She can't keep anything down and is refusing to drink. I did manage to give her a breastfed but she pushed off me and threw up, which means she hasn't drunk for about 8 hours.
When should I worry?