Need help

My daughter just turned one today & I have my 6 day old daughter here as well. Who has been through this and how did you get through it. Right now I’m a stay at home mom. It’s been hard past couple of days & I have cried almost every night because I feel like my daughter that just turned 1, feels like I’m neglecting her. She’s been so cranky and just been throwing a fit. I’ve been doing my best to spend time with her and I do. Since the little one mostly eat shits and sleeps. But when I’m with her all she does is cry. And it’s been stressing me out that I feel like I’m failing.