How do bed bugs spread?

Bedbug form after bedbug nymphs hatch out of eggs laid by female bedbugs. Bedbug eggs which look like a grain of salt ;aid on hard surfaces stick to the surface and so may be unwittingly brought into a home in second hand beds or furniture bought or in clothing. When the eggs hatch the nymph is able to detect the breath of any person sleeping. It will be attracted to the sauce of that breath, that is to the bed in which somebody is asleep. It will climb up to that bed and find the sleeping person and have its first meal by sipping the blood of the person asleep in that bed After its meal it will find a hiding place close to the sleeper, which may be in the bed such as in a fold or crevice in the mattress or somewhere nearby such as in furniture near the bed. It will then come out again for more meals over next few weeks and after each meal it sheds its skin and grows om size. After five skin shedding after meals it will have become an adult bedbug and ot can then breed to create more bedbug so in time females lay more eggs in or near that bed so when they hatch causing a bedbug infestation of that person's bed. That is how they form in beds.