Answer: I'd apply the weed and feed now and wait until this fall to reseed the bare areas. Sometimes grass seeds dehydrate after they've begun to germinate and they simply wither away. It's important to keep the seed bed moist and you may need to water more often than twice a day to keep the seeds moist. Planting in the fall when temperatures are cooler and rainfall usually abundant will make grass starting much easier.
Best wishes with your lawn!
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