If my husband do not want another child although we have one child only. How to convince my husband to try another child?

There should be a reason why your husband do not want more children. Try to ask him what about in future, if he want another children. My husband actually wanted only 1 as he find stressful in child upbringing, but I managed to convince him my daugther needs a playmate. Eventually, he finds it is wonderful to see them to play together and now we have 3 kids already.