We had a first timer calf at least 3 weeks early (if she was bred the day bull was put in). Mama doesn't have much of a bag at all. Is that to be expected with an early birth? Calf is doing good, will not take a bottle, but is nursing every time it's awake. It's active and seems ok, just very small, maybe 35 lbs? I'm sure it's not getting all it wants but maybe enough to get by. Suggestions?