Congrats on the new low girl! I'm so happy for you
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My sis took the baby to the doctor and he thinks he has colic or reflux, hence the constant crying. I must say with my own baby lately I've been leaving her alone with her little tantrum, which seems to end after I stop paying attention. So I think none of us pointed out that the difference in ages plays a big part in deciding which strategy to use. So of course a newborn under 6 - 12 months should not be left to cry while your strategy of ignoring the crying might work with a 19 month old having a temper. Glad we got THAT cleared up LOL.
I disagree with you on the not ever leaving a baby to cry. I think there are sometimes when it's necessary. For example, if the baby is put to bed for the night, and is fine until put in bed, then starts crying only because they don't want you to leave, they should be left to cry for the 5-10min it takes them to fall asleep. Most babies cry when they are tired, so it's only natural they cry when you put them down to sleep. Otherwise they learn that if they cry, you'll come running every time. This is usually only when the baby is well past the newborn stage--say 5-6months on. I know plenty of parents who new very well their babies were perfectly fine and only crying b/c they wanted to be held. They will never learn to sleep on their own if the parents come running in the room everytime. You may disagree with me, but I don't believe it's heartless. Neglecting a baby who is in need of attention is bad, but when there's nothing wrong, and it's time for bed, I feel it's ok. Also, during the day, they don't need to be held every minute of the day. You'd never get anything done if you did. Obviously, babies need to be held, but not 24/7.
In my experience, newborns don't usually cry unless they either are hungry, tired, in need of a diaper change, or are sick. But when you said he cried unless he was held, it sounded more like he was just crying to be held. Colic is a bitch. I have heard that if they're breastfeeding, cutting out wheat from the mother's diet can help tremendously. Otherwise, I think there is medicine you can give them. According to my gran, my dad had a terrible case of it, and some green drops in his bottle did the trick. I hope the doc gave your sis something for the poor guy. If that's his problem, no wonder he's been crying all the time.
You're spot on ignoring your daughter's tantrums. They feed off the attention, so when no one's watching them, they soon realize there's no point in throwing one, as it isn't going to get them whatever it is they want..lol.
I can assure you that a baby who is under a year old is capable of being fussy because they are pissed. My story about my ex-friend's baby is a prime example. She was fine until her mom walked out the door. Then the crying began, and didn't stop unless she was sleeping or her mom came back. She wasn't hungry, sick, tired or anything else--just a momma's girl who was mad that she was stuck with me.
She never gave me any trouble until she hit about 9 months. Then it was torture. And, man, could that baby fill a diaper! If I was holding her and heard her fart, I knew I'd better get her to the changing table pronto, or both she and I would be covered in poo.
Then again, I'm already up half the night...lol. 
Hey there,can ya guess where I am going tonight,lol some place your grandma likes to go lol???Have a gr8 day and GL with the challange weigh in,I am down -1lb this week and it would have been more but TOM came yesterday!**huggs***Tammy