I was doubtful about using the second seat (note they don't call it a toddler seat) with my newborn, but it is great. I had him in it at 2.5 weeks old at the baby expo. I think it's more suitable than the main seat. I doubt 2.5yo DD would've let me put her in it anyway!
Pregnant for the first-time?
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Our Insider Programs for pregnancy first-timers will lead you step-by-step through the 14 Pregnancy Must Dos!