I am an only child and loved it. had a great relationship with my parents and never wished for a brother or sister although I do enjoy having SIL now (most of the time). DH and I debated long and hard over whether we would have another but in the end we decided we would like to try for another but I am pleased we left it a few years as that way each child gets one-on-one attention as the other will be at school (nearly). also I didn't think I could parent the way I wanted too with 2 under 4-5yrs without having a nervous breakdown. Also Ds is really looking forward to having a brother or sister. Good luck making your decision