To sell or not?

J

So I have a lot of things that my son grew out of fairly quickly, most of them I bought new, some were handed down to me or given to me. So I'm wondering if I should sell them now or just wait because I do plan on having more kiddos but not for a while, plus being a single mom with zero help I could really use the money at the current moment. I just am having a hard time wondering if I'll have "wasted" my money by selling them now and then buying new or different things when I have more kiddos. What would you all recommend?