To feel guilty after unsolicited advice?

[ZestyLimeAndKiwi]

At baby group I was talking to a group of ladies two of which I know out of baby group and one I only know through the group, infact this was only the second time I had met her.
They all have DC that are about ten months whereas my DC is 9 weeks so I feel a bit of a novice compared to them.
We were talking about co-sleeping. I told them that DC comes in bed with me at 4:30am when she wakes up and I keep her with me till we get up at half seven. I'm sure this is probably giving her awful habits 😬 but it has been working for us.
Later in the session I was feeding DC from a bottle and the lady who I don't know too well said to me "You do know you shouldn't co-sleep with a formula fed baby". Now I feel terrible. DC Is formula fed in the day and breast at night. I honestly didn't know that I shouldn't do it. I also feel really foolish and silly that she was telling me what's best for DC. Do I try and stop this habit now? AIBU for feeling a bit foolish for not knowing this and a bit miffed this stranger told me.

I got told co-sleeping with my fully bf baby with a bed set up for co-sleeping safely, - with DH sleeping else where - would kill my baby and this was by one HV

The suggestion was I go downstairs and bf on sofa - apparently fears I'd fall asleep and sleeping on sofa is super dangerous were unjustified . I couldn't catch up on sleep during day as had toddler.

Co-sleeping is very controversial. I think ff babies do have increased risks - but if your still bf at night I'm not sure they'd apply.

I'd do you own research - and learn to ignore unwanted advice as IME there is so much given you as a mother.

I mix feed and co-sleep too. People will give you a lot of advice, and most of it will be utter horseshit, so learn to make polite mmm noises while mentally rolling your eyes. Your baby is breastfed, just not in th day so her advice didn't apply to you anyway, but it's not her business and you don't owe her an explanation.

I've also heard this advice, because formula feeding mums tend to put baby face to face where pillows can be a problem, whereas breastfeeding mums put baby face to breast with the baby kind of enclosed/protected by the mum's arm/leg/body. But you can read up and just make sure you're co-sleeping safely.

If something works for you it's not a 'bad habit' just because people say it is. I co-slept with all mine and I get to sleep all night in my own bed without getting up if the baby wakes. Then at 2 they go into their own room/bed no problem. Co-sleeping is fucking awesome. Everyone and his dog told me I was making a rod for my own back, where's the rod? Why should you make things definitely difficult for yourself and your baby right now, just to avoid a potential scenario of things being difficult later when that may never happen?! Do what works for you.

Do your research and make your own mind up. Then don't tell other mothers!
DS co slept until he was 4 and is now a happy, confident secure 13 yr old who still occasionally jumps in with us ( we have a 6ft bed). However he didn't start cosleeping until 7 months so was able to roll away, up till then he was in a carrycot next to the bed. He did have a spell in his cot at the end of the bed but I damaged my back and was unable to bend to put him back after night feeds. He was bf so as time went by it just became the norm. DH was happier with him between us and would sleep in the spare room if he had had a drink.
We just did what felt natural and have never regretted it. It was much easier while bf and apart from when DS had chicken pox we never had sleep issues.
Despite all the unsolicited advice from friends and relatives DS has never had problems sleeping on his own.