Great post Mantaray....agree totally with your comments.
I would be heading off to baby clinic to get your baby weighed....and monitor it over 7 -14 days.
I personally think 4 months is way too young, but each to their own.
Can she support her own head?? Ithought it was a no-no to give baby solids when their head control is still developing ??
Good luck in your decision....