If you are frequently finding bats in your house, especially baby bats, then it may indicate that you have bats roosting in your roof.
If you have been moving items around in the loft space, and then notice that bats keep coming into the house then it might be that you have inadvertently blocked the hole that they use to exit the roof. This means that the bats are finding their way into the house as they have been forced to look for an alternative exit point. You should go back to the loft and move away anything that is potentially blocking an exit (for example anything that is against outside walls), and then contact your local Statutory Nature Conservation Organisation for a roost visit - either Natural England, Countryside Council for Wales or Scottish Natural Heritage depending on your location.
Additional advice can be sourced from:
Bat Conservation Trust (BCT):
Telephone - 0845 1300 228