How do you to a big bed 😩

K

My son is such a wiggle bum 🙈 he’s 2 years and 1 month old and still in his cot but he’s starting to try and climb 🤦‍♀️ I just can’t see us being ready to take the side off to be a toddler bed. Tonight his head are where his feet where when I put him down this doesn’t happen often but every night he is all over the place and I worry that with the side off he’s gunna be on the floor. My mum said he will figure it out is this true?