I need some honest answers?

I really want a second child my first is 14 mnths. So here are my two questions: right now I'm 230 I'm trying to get down to 130 my husband saud once I get down to that weight I'm going to enjoy it and not going to want to gain weight what would you do? Right now I'm saying I still want another one. Second question is I want twins and of coursebi know I just can't have them because I want them but there is this tribe who are mainly twins every person and their diet consist of yams which was proven to help your chances go up so when should I start eating them?? Thanks in advance!