My DS is just over 4 months old and recently when he gets tired he gets hysterical. Screaming, crying and going rigid, it's really upsetting me and DP and my nerves are shot to pieces after 4 screaming episodes today. Is anyone elses baby going through this? The screaming and crying lasts anywhere between 10 & 30 mins and nothing will calm him down. We both try and settle him in different positions, with feeding, rocking you name it but nothing works! He just seems to give up after a bit. Just hoping were not the only ones and it's a developmental thing.