10.5month old slow development?

[Magic28]

Hi, my baby isn't crawling yet or cruising. DS can sit unsupported if I put him in the position but want get into it himself. He does often push up on his arms nice and high ans has lifted his bottom but rarely. He rolls around but isn't very mobile and I have to carry him everywhere and he's very heavy. I'm a FTM so I don't really know what's normal and what isn't. Should I be concerned?

Dd couldn't sit her self up till 12 months .
She crawled at 12.5 months and pulled to standing at 13 months

My son couldn't crawl, sit himself up or pull up at that age either. He took his first wobbly steps on his first birthday, and was a sprinting menace within a few weeks. It can all change very fast. Make the most of him staying where you left him for a bit longer!

Thanks, I can't wait for that to be honest. DS is so heavy now over 21 pounds pounds and it's hurting my back carrying him around all over. He also cries when I leave him so him crawling or walking after me can't come quick enough! He going through major sleep regression waking 2-3 times a night as well and I could cry.

Mine still cries when I leave and she can run haha