Hi A.,
The only thing 'normal' about babies is that every baby is different. It frustrates me so much when I hear people say 'your baby SHOULD be sleeping through the night' or something like that. Even meeting milestones have a big range of acceptable.
My daughter did not sleep through the night for quite some time. She is a child who demands ALOT of interaction. She was never content to just lie in her packnplay, or in her crib if she was awake. She wanted interaction.
I don't know what the 3 day sleep solution is quite honestly. I am a firm believer in NOT doing the cry it out thing until they are older. Babies under a year old I just believe should NOT cry it out. Infants need to know that mom and dad are there for them and will help them. Letting them cry it out just teaches them mom and dad will NOT be there to help them.
I know a mom who is a big CIO'er. She did it with her twins from very early on. Recently, her 13 month old daughter was sick in the middle of the night, but she never knew it. When she went into her room in the morning her daughter was COVERED in throw up. Her daughter never cried out that she was sick. Of course not.... she has learned mom won't help me if I call out! This is a true story ... honest.
Ok, now that I've given you my opinion on CIO ... here are some other bits of information that could explain what is going on.
6 months is a big transition. Many babies start cutting teeth, many babies are learning new skills and growing at a rapid rate around this age. ANY of these things can cause night wakings. I know many doctors will tell you that teething won't wake them up. Obviously these doctors have never actually HAD kids. Swollen sore gums with a sharp little tooth trying to poke through is NOT comfortable for a little one!
In addition, there ARE such things as growing pains. My OB told me there was as study done to evaluate how kids grow. All at once, or little bits at a time. They found both happen, but the surprising thing was that kids can literally grow overnight.... up to 1/4 inch!!!! WOW! If my body was stretching out like that while I was trying to sleep I think would be crying too!
New skills.... learning to stand, roll over, crawl.... they get soooo excited about trying their new skill they want to practice ALL the time! (and by the way, that never stops. My daughter LOVES to practice going up and down stairs... over and over and over and over again!) So, if they wake up in the middle of the night, then hey! ... it's a great time to practice! Let's wake up mom and show her what I can do. :-)
The other thing is some babies just need some extra help. They are highly active, highly alert, and just want to go go go. Babies are not born with the knowledge of how to soothe themselves. We have to teach them those skills. Some kids are naturally just mellow... and can lay there until they just fall asleep. Others, need help settling down. There is nothing wrong with them...they just have a different tempermant.
My daughter is highly active. She is one who needs help settling down. I am happy to say, we have been patient with her and now she can fall asleep on her own. Some friends of ours have a daughter who is just 3 days younger then our daughter. She is mellow. REALLY mellow. From day one she could just lay around and watch the world go by. She had NO trouble going to sleep.
Two girls... born within days of eachother... both TOTALLY different.
Infants, and at 6 months they are still infants.... cry for a reason. They need help of some sort. They are not manipulative at this point. They don't understand what it means to manipulate. Cause and effect is only just emerging for them. I know you aren't getting a lot of sleep....but it will get better. Just remember, making sure your kids are secure in the knowledge you will help them .... that will go a long long way provide them with confidence later.