Advice

My baby boy was born May 1st and is definitely a mama's boy.  I'm really starting to feel anxious because I will be going back to work soon.  He cries and fights sleep terribly when with my mom, sister, stepmom, etc.  Yesterday I had to go to the dentist and my sister watched him. When I left he was taking his bottle and then she texted and said he was screaming.  I was gone an hour and a half and he screamed the majority of the time.  He finally passed out from exhaustion.  Does anyone have any advice?  I just don't know what I'm going to do.  Thanks in advance. Here is a pic of my rotten cutie. ;)