My little one has slept through since he was 5 months in his own cot in his room. My partner has been off work because of covid since he was born but this week he started back. My little one only sees me and my partner, now only me. The past 2 nights when I put him down he cries uncontrollably until I get him out, at which point he instantly falls asleep on me and I put him back in cot. Any reason this could be happening all of a sudden? Sorry I'm a first time mum and thought I had his sleep pattern sorted. Thank you.