3 month old

Jennifer
FTM - Olivia will be 3 month on Tuesday. I still swaddle her because she is so jerky when she tries to fall asleep and sometimes when she is asleep for a while. She moves her arms and legs. When does this stop?
Also when do babies generally sleep through the night. She was getting up twice, but has converted back to almost every 2-2 1/2 hours. She is not drinking her 4 oz bottles either. I can only get 2 oz done at night. I will be going back to work in September. I am exhausted. TIA