Does daily masterbation and ejaculation decrease sperm and hurt chances of having a future baby? thanks so much?

It should not but if you have concern, moderate is the best approach in any activities. In general, three to four ejaculations per week is considered moderate at your age.

It might lower sperm concentration. But all you need is one healthy sperm for fertilization. Suggest some other source for sexual outlet as too much of a good thing is not necessarily a good thing