I am a first time mother and I have a 4 month old baby girl. She stretches so severely and intermittently. Could this be normal? What could be the cause?
If there are no additional worrying behaviors (cries, painful expressions, arc-like bending instead of a straight stretch) I'd say it's normal, it's OK, it's even good, because muscles, apparently, are working as they should.
And it seems so "severe" because we are used to babies lying with their legs bent, curled - a baby stretched, with straight arms and legs, seems somehow unnatural. It isn't, though:)