Since last night my LO has been eating almost double what she normally eats. Usually when she is done with the bottle, she'll push it out with her tongue, but the past couple feedings she just eats and eats. I thought maybe it was a growth spurt, but then she ends up spitting up so much and tonight she vomited. Am I just over feeding her? If you are bottle feeding how do you know when its a growth spurt vs overfeeding? LO is 9 weeks.