Here is grandson Taylor last weekend. 18 inches, very plump, 4 pounds.
Normally I would not question an expert of your calibre Dave, but I believe that you should recalibrate your scale and double check your measuring tape. Taylor looks significantly bigger than that to me.
JHAP ~~~~~~~~~~ "My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives." ...Hedley Lamarr (that's Hedley not Hedy)
