Which expenses can I deduct for babysitting? For example, I had to purchase crib, high chair, toys, etc, are these deductible?

I started babysitting in the 3rd quarter of 2017 and went to enter the income only to discover now I have to set myself up as a business.  I am looking for information on what I can deduct as an expense as I had to purchase a crib, high chair, toys, etc.  I babysit an infant in my home for a family member.  I did not expect this to be so complicated!