I want opinions please!!

Mikayla • I'm 23, married for 4 years, we have a beautiful 2year old little girl! she is our universe!!!! I'm a cancer in a home with two Capricorns!!!! Baby #2 due may 2019!
So I'm almost 22 my husband turned 25in December. We have a two month old. Before we got pregnant with her he used to say he wants a vasectomy. Then we found out I was pregnant and he was over the moon to know we had a little one coming. Now that she's here he asked me if he could finally get it done now that we have a biological child together. I always said I wanted atleast two like my siblings had. But I am OK with just one if that's all my husband wants. My question is what do you think? Should he wait till she's older and see if he changes his mind? Is he too young for something like that? He mainly doesn't want another Bec post partum almost got the best of me and he said he doesn't wanna see me like that again plus it got to him as well