Bed bugs are small brown bugs. Adult bugs are around the size of an apple pip. Bed bugs do get larger once they have fed and their colour can change from a dark brown to a reddy brown.
Baby bed bugs have a slight yellow tint when first hatched and unfed. After they take there first fed they will get their brown colour.
Bed bug eggs are white/cream in colour. Once eggs have hatched they will have a hole in one end.