I have a 3 yr old and another on the way. Sometimes I also feel like I dont't get to spend quality time with my husband and my girl. Whenever work gets shitty, I just remind myself: "it's just a job!". To me, work-life balance means compromising something for another, so I choose to forgo some work and put family first. Even if it means slow promotion, small PB...work knows that it plays second fiddle in my life.
Husband is also important. He works longer hours than me and sometimes on Sats too but he helps out around the house and with our girl. Do try and get your hubby more involved, because with all the demands on your time, it's difficult to do it alone.