Is not having baby be babysat bad?

Da
My MIL is trying to push me to leave my 5 month old with her. I honestly don't feel ready, I haven't been away from her for more than 10 minutes in her entire life... I haven't even left her with my SO. My MIL is acting like I'm stunting her growth if I don't leave her with other people. I'm staying home with her until she's 14 months then going back to work. Do you think it's bad to not leave baby? Anyone else not left their child with someone until they were closer to a year? She's EBF and has never had a bottle...