Yup, or hire someone to be a live-in nanny, and you'll have a lot more time to spend with each child individually, plus it will give you a chance to rest...I have one and one on the way...I'm dying to sleep..lol.
Were you having issues balancing this before you were pregnant wiht your 4th? It just comes naturally to me. I just make it happen. DH is gone a lot with his job and I am on my own with them a lot. We have three kids. It has always come natural to both myself and dh to balance it.