Training through the early months of parenthood is tough but doable. The Tinman schedule posted above is excellent. You could sustain that schedule and improved for a long time training like that. Throw in one or two races per month and you've got a nice recipe.
If you're like me, you may find out that you prefer this type of training to your previous methods. I have been following the same basic schedule for three years now:
M-50 minutes with 7 miles @ aerobic threshold (5:45 pace)
T-50 easy plus striders
W-50 minutes with 3 x 1 mile at 12k pace (90 second rest)
R-50 minutes easy plus striders
F-50 minutes easy plus striders
St-2 hours medium with striders
Sn-50 minutes easy plus striders
On this training, I have run 15:12 5k, 31:30 10k, and a 2:28 marathon---not PRs, but within 2.5%. That is, I'm training at 50% of my former training mileage, but racing at 97.5% of my personal bests. I actually like running again too.
My revised training schedule was precipitated by the birth of my daughter.....good luck Milt.