Girls, hello! Can you tell me, my little one has always slept soundly,…

Girls, hello! Can you tell me, my little one has always slept soundly, I thought after 3 months it would sleep more calmly. It reacts to any movements and rustling sounds when rocking, continues to sleep. If he sleeps alone, then all the sleep is lost, this applies to daytime sleep. We saw a neurologist, forgot to clarify ? Now only at 6 months. Is this normal?