we took Miss B to the NT scan and she was only 18mths - and as soon as she saw bub on the big screen she jumped right off DH's lap and ran to the screen saying "Spud" and "Baby" she was soooo excited and it was so cute - we are taking her again to the Morph scan, she is pretty excited about new bub! not sure how much she understands exactly but she keeps saying baby in mums tummy and lifts my shirt up and gives spud a kiss everymorning!