I work for a company in MA with more than 50 employees. My child was born in December. After the birth, I spent the first 12 weeks at home to care after my child on an unpaid maternity leave. While I was pregnant, I spoke to my manager and he agred that I would work part-time for some time after the 12 weeks so I could breastfeed my child. Now that I have returned to work, my manager has told me that the company needs me to begin working full-time hours. I can't work full-time hours and I am afraid that they will fire me. Can I ask them to give me a lay-off instead?