Small insects - Please help? ?

We recently moved into a bungalow in Leigh on Sea and have discovered these small insects in our house that seem to like dust and dirt. It does not matter how much I clean the house, they are always back within hours. In colouring they are whitish brown and look like tiny spiders. They are all over the place, in the kitchen, bathroom, bedroom. Any suggestions to what they are? I am worried because I have a baby due in November.