Planning self care after birth

I told some coworkers about my idea to get my hair done after I gave birth. Not the day after, obviously, but sometime during my maternity leave taking some time for myself to get my hair cut and colored. My husband should be more than capable of taking care of baby alone for a couple hours so I don't see the problem. But some people were saying it's a selfish thing to plan for, and I shouldn't spend my money on myself like that, I need to spend my time with my baby, etc etc etc