My husband is a great help, and he has excused me from doing any household chores since our baby was born. The only thing I have to worry about is taking care of our baby. He is a good boy and tends TO get agitated when I change his nappy or wash him. He likes to be in my arms, and as soon as I put him in his cot, he demands that I pick him up AGAIN and hold him in my arms. He also gets uneasy and a bit tearful when he is suffering from colic. Note > SINCE can only be used with perfect tenses > I HAVE not seen him since .....?Since last week , I HAVE BEEN.... Check where the "commas" are placed.

My husband is a great help and has excused me from doing any household chores since our baby was born. The only thing that I have to worry about is taking care of our baby. Just these changes. The word old was unusual - it looks like a word that was mistakenly left from a previous edit. I can sometimes do that if I am still deciding what to write as I type. Given your level of English writing skill, I am marking it as a simple oversight.