Reluctant spouse- arguments pro adoption

I am sorry that this is coming from your husband but it seems like he is thinking rationally. First of all, he might be thinking that you are both old to support the child and if he is a toddler, by the time he or she will be grown up, both of you are old enough to be grandparents. The clock is ticking. He is also contented by the current child you already have. It is not about the love that both of you can give but rather, the contentment you already have with your current one.