its seems to me the baby has started associating your lap as his bed . It is good habit if you put him to sleep awake in his own bed . try to settle him gently in his bed with consistent practice he will sleep in his bed. otherwise sleeping in your lap can become a habit wuich will be hard to break

same case with me any suggestions

hii Neha. seems we are on the same boat. babies seek warmth in winters. may be that's why they want to sleep in the lap.