I have a 9 month old who woke up at 4:30 AM, hiccuped, then vomited. The vomit was breastmilk white, with some remnants of solids from dinner the previous evening. She is breastfed with the introduction of solids with each meal. She did not have anything new to eat the evening before. As is typical for her, she woke around 2:30 AM for a breastmilk feeding.
The weird part is that there seems to be nothing strange or different about her aside from that episode of vomiting. She has never vomited or even spit up in her life up till now. Temperature feels normal, and she is acting her normal happy self, and was her normal happy self before bedtime the night before.
To the question: What could be the causes of vomiting in an otherwise normally acting pre-toddler? Is there anything to look out for that may help to determine if she is coming down with something? I'm not very concerned at all - just curious.