I see the breastfeeding mothers watching me as I rummage in my changing bag for the ready-made carton of formula. Those looks speak a thousand words, most of which boil down to, "How could you? We're doing the best for our baby, why aren't you?"

I feel as if they're judging me, looking at me as a lesser mother than they are just because I'm giving my baby formula. Do they feel superior to me? Certainly I feel that I have to defend my decision to bottle-feed, justify my choices so they'll accept me.

They sit at the postnatal groups with their beady eyes peeking over their breastfeeding aprons as my son gulps down his 5fl oz. But I can't help noticing how their looks change – a bit of envy maybe? – when I start to bottle-feed. My guess is they're thinking,"That looks a lot more efficient than breastfeeding." You're right, I want to tell them.

I can almost hear the deafening mental processing in those staid church halls: "She won't have cracked nipples, mastitis, thrush or leaking milk. And her partner probably helps with the night feeds."

But I don't want to fall into the trap of judging them too harshly, either. I'd like to have tried breastfeeding, but medical complications took the choice out of my hands. Now that I bottle-feed, I see the advantages. I'd even choose it again next time. It's really not so bad, I want to tell them, you should try it some time.

• Tell us what you're really thinking at mind@theguardian.com