Hi Roya,
My first two are 22months apart and from what I can remember I used to set the oldest one up with a little tray of snacks and a drink during the day while I was feeding, and had DVD's close at hand. Sometimes I read him a book while I was feeding. At night I was lucky enough to either have my DH or my Mum around so my oldest was occupied. It does get easier its just an asjustment. Hang in there
Sue