I *think* the shaking would have to be a bit more extreme than this to harm bubs. I know from very, very early on, as soon as he could put any weight in his legs, my DS would just bounce and bounce and bounce on my lap and just love it, so I think the motion comes naturally to them and must be soothing. I'm afraid I don't know where the line is, but I suppose it always makes sense to err on the side of caution and ask your hubby to just be a bit more gentle.

I had to laugh reading your post, though- there were so many times I almost had a heart attack at how DH was treating our little guy. Not violent or anything, just not as gentle as I wanted. DH rocks and bounces our DS pretty heartily too. Must be a guy thing! I can't imagine it would be relaxing, but DS seems to like it!