So my little girl is almost 4 months and she's not eating as much as normal. I fed her before she went to daycare at 8:30 (she ate about 4.5 ounces) and her teacher fed her about 3 hours later and she only ate 2 ounces and then spit up half of it 20 minutes later. I just fed her and she only took about 3 ounces and doesn't want anymore. Should I be concerned? Or is this just her not growing at the moment?