Ate, if your 2-month-old is vomiting (kahit tubig lang), kailangan talaga ninyong makita ng doctor kaagad, hindi ito normal at maaaring may something that needs checking. Pwede itong dehydration o ibang concerns na kelangan ng medical check-up na. I know it's scary pag ganyan ang baby, pero better safe than sorry talaga! Get her checked out ASAP, ha? Sending love.