You might find this article interesting
https://www.healthline.com/health/breastfeeding/baby-falls-asleep-while-nursing#takeaway

Put an article of your clothing (something with your scent on it) in bubby’s bed.
You could also play a recording of your voice either soothing him or singing.
Hope this helps

keep putting bubs down every time he falls asleep you don’t want to be stuck holding bubby for 2 years or more. just keep trying eventually it will work place hand firmly on bubs back

Do you burp him? Is he warm enough? Some peole give them a comforter – a toy or piece of cloth (ie square of muslin so it thin enough to be breathable through if gets on his face) that you have kept in your bra for the day so it smells like you. Otherwise maybe he’s falling asleep but still hungry – I used to try and keep my daughter awake during feeds and put her in bed still awake so she would self settle. They change all the time though! Save our sleep by tizzy hall has some good tips but take it with a grain of salt as some things she said I found ridiculous but different things work for different babies

Wrap him then gently rock him on his back, make sure he has no stimulus in sight and don’t make eye contact – you might gave to rock for 20 mins or so or go back and forth between rocking him and leaving him before he nods off

My eldest was a little like this except she would only sleep for 5mins no matter what….day and night… 5mins of sleep and 4 hours of screaming…if i was lucky. I saw several Doctors and no one was any help at all…I just gave up trying to solve the problem and learnt to start prepping dinner first thing in the morning and hopefully getting it cooked by dinner time…life was a nightmare but at about 14mths she started to calm…thank goodness….how i managed to stay sane i have no idea.
I feel your pain and hope that you find someone with some answers.
btw…my 2nd and 3rd child were totally different and slept.

im just reading sleeping like a baby y pinky McKay. she is pro co sleeping.
cant really train until after 6 months, maybe try a swaddle bag? white noise? boys are always hungry and needy lol. my 6 month old isn’t much better :/
only small once, hope you get some sleep.

Wake him gently (try changing nappy), and put him down in his cot while he is drowsy. A baby will wake up if the condition he falls asleep in change (from being held to being in a cot) so the goal is for him to fall asleep on his own in the cot. Easier said than done, I know but give it a try. It works with my son and now applying to my 8-week baby girl

Some babies are extra clever! My two are both the same, my first much more so. Like the previous commenter I invested in an Ergo baby carrier and bubs slept on me, or my husband, parents or babysitter/au pair. He also didn’t like being horizontal (possible silent reflux in hindsight), so most naps were upright in the baby carrier, and later (like 18 mths or more) in the pram. He is now an excellent sleeper (4yrs) if it’s any consolation They’re all different. He is also hyper sensitive, which has improved over time, but environmental noises, smells, lights etc always made a big difference too.

sorry I cant help too much with this as I didn’t breast feed my children and they never slept with me at all. Maybe consult your doctor or a midwife if you are still seeing one regularly. They can give great advice.

Have you tried not waiting the 15 minutes and putting him down earlier. make him finish on the boob by tapping under his chin. Once finished change him and put him straight down. If this doesn’t work possibly try propping him up on a corner/horseshoe pillow so that it wraps around him like you do. Hopefully you find what works for you

My second one was just the same. We called her our Vertical Bub. I tried everything. So did Dad and my Parents. Then I bought a good Front Baby Carrier and popped her in this. She went everywhere I did. I knew she was happy and it made my life easier. I decided early on that I will take the path of less resistance. Do things that work for my family. She did grow out of her horizontal faze. It also made me take some time out to just sit still and love and hold her. They are not babies forever they grow up way too fast. I had three in three years. One in the pram, one in the front carrier and one walking. Worked for me. Best of luck Mum.