First, lay two very small, very "fragile" babies on the floor:
Then let bigger, older, 18-month-old sister out of her room to come look:
Third, let bigger, older, less careful than mama would like sister KISS said smaller, more fragile baby.
And if you really wanna make Mama nervous, let bigger, older sister TOUCH smaller, more fragile baby in the face, preferably the mouth or nose.
Or you could just stop her before she actually touches baby...which I did!