How old is your baby? I got Missy at 8wks and Max at 12 weeks and both their ears were up. After a month or so they did start to fall so I trimmed/shaved the top corner and they popped right back up. They are now 10mo and 8mo and I still keep the top corner of their ears trimmed.
Give it a try
since they were up before they should pop right back up.