[Edit] 
Bed bug babies (first instar nymphs, as entomologists call them) are 1/32 inch or 1 mm in length. If they have not fed on human blood yet, they are off-white or transparent in color. After their first meal, they are bright red. There are photos of the full bed bug life cycle as well as individual fed and unfed nymphs at the link below: "Bedbugger: photos of all life stages of bed bugs."
First answer by Nobugsonme. Last edit by Nobugsonme. Contributor trust: 53 [recommend contributor]. Question popularity: 2 [recommend question]
