Sibling issues

I have a 7 year old girl and a 5 year old girl. I just had a baby boy 7 weeks ago. My 7 year old is naturally an emotional person. She loves the baby but is missing her time with me. I tell her it will get better but, it’s hard to watch her have to adjust and feel sad at times. In the mean time I’m exhausted and I know I’m not as patient as a result. Just feeling overwhelmed by it right now.