If you earned more than $400 net income (income less expenses) working as a self-employed individual (or independent contractor), you must file a Schedule C, business income and expenses with your personal return and pay self-employment tax -same as withheld on a W-2
If you otherwise earned enough to file a return, you must report your self-employment income, no matter how small.
Simply follow these steps to enter your income from self-employment.
To add business expenses to your babysitting income, you will need to upgrade to TurboTax Self Employed Online.
Or, you can purchase a less expensive version -TurboTax Desktop:
https://turbotax.intuit.com/personal-taxes/compare/desktop/