Our youngest children are the same age, and after reading through some of your answers, I realized that their personalities are very much alike. She has always been a super clingy baby, and as she aged, became more and more whiny. I ignore it when I know she doesn't need anything, but her tantrums are becoming extreme. A few days ago, she threw a fit that came out of nowhere, and it lasted for over an hour. She wasn't hungry/thirsty/poopy/wet, etc, so I simply left her on the living room floor, and sat on the sofa ignoring her, and waiting for it to pass. I know tantrums can be normal at this age, but the duration of her's is not. My oldest is moderately autistic, and well known for her 2 hour plus meltdowns. I'm not sure if my youngest is now taking cues from her sister or not. Frankly, she shouldn't be, since my oldest has been in part-time pre-school for several weeks now, and since starting therapy, her fits aren't nearly as severe now. I have noticed a few Autistic red flags in Anabelle (my youngest), and mentioned it at her 12 month checkup. She has an appointment coming up with Early Intervention Services so we can figure out what's going on regarding that. I never had to put Paisley, my oldest in time-out until she was nearly 2, b/c she was a perfectly well-behaved child up until around 18 months. I thought about a time out for Anabelle, but I'm not sure if she is old enough to understand the concept, and with her tantrums lasting soooo long, I certainly don't want to leave her in there until she calms down. I know if I did put her in her crib when she gets like that, she would only scream louder, and longer, all the while banging her head on the wall. What the hell am I supposed to do? I'm at my wit's end once again....especially knowing that I very may well end up with 2 kids on the spectrum.