I realised that I have very few friends, especially after I became a mum. How or where can I go to look for friends?

For me, it is the reversed -- most of my close friends are married and with kids and I have no problems hanging out with them and their kids. In fact, I treat it like a training ground for when I become a mother, I get a lot of useful tips, anecdotes and funny stories whenever I meet up with my mommy friends. Maybe you can seek out your current pool of non-mommy friends -- there could be some who are just like me and actually love being around moms and kids.