A little update, after all your help.
I have found nighttime difficult to apply the WIWO as cries seem more real at night... However, last night, I decided to do better & DH agreed that he was happy to support me & didn't feel DS would wake twin DD in other room & if he did, DH would cope.
I put him in his cot at 7pm. He was asleep by half past. He woke at 3am & I went in as he sounded upset. He had pooped so I changed his nappy (he was going beserk on the changing table - I think he thought I'd put him straight back to bed), gave him Nurofen for teething & put him back down gently. I left the room and he drifted off.
Until 3.35am! He woke again but I knew he was clean, had pain meds & the cry sounded more of a protest so, with my DH beside me, I waited & listened. I really felt I tuned into him well
I also use counting. If I get to 10 & he has paused, I start counting again. It helps me recognise real crying. After 16mins, he was quiet & asleep.
45mins, he awoke again. I waited. He protest-cried, much quieter this time for 3mins, then fell asleep.
At 7.45am I went in as I thought I hear a movement. He was sitting in his cot & gave me a big smile and an excited squeak to see me. We had the best cuddle.
I've put him in his cot at noon amd can hear him snoring.
Thank you for the advice and support. I know I have a long way to go but I feel much stronger.
Hopefully, it will make be better-equipped when its his sister's turn next...
Xxxx