How old is your little guy?
Frankly, I am not a fan of crying it out until they are more then 12 months old. Babies are not manipulative. Babies cry for a reason. They need something. Even if it is just to be reassured mom is there.
Some kids are just high need kids. They want to be held. They want to interact. They won't just lay around and stare at the ceiling. Some will. My daughter wouldn't.
Crying it out just teaches them mom will NOT be there to help them.
Sure, he may be fed, he may be changed...but maybe it is a growth spurt and he is uncomfortable. Or maybe teething... or maybe he just wants to be near mom.
Have you tried wearing him in a sling during the day?
Babies make a BIG transition when they are born. They go from 24/7 being rocked, cuddled, fed, held ... to something DRASTICALLY different. For some, that is a transition that takes a very long time to adjust to.
Have you tried a co-sleeper? My daughter did much better once we put her in a co-sleeper and she was right next to me. Listen to your son. He will tell you what he needs.
High energy babies have a hard time soothing themselves. We need to TEACH them how to do it. They aren't born with that knowledge. I never perscribed to any CIO method when my daughter was younger. I thought 'I don't like to cry myself to sleep... why would she.'
When she was about 15/16 months old, we did start. I knew by that time she was fully aware of what she was doing. I knew she knew we were there and she was just trying to exert her own will. Within 2 days everything was done and now she goes to bed with no problems at all. I did NOT want to do that until I sensed it was a battle of wills... and I knew that was NOT happening at an age earlier then 12 months.
Basic needs. That is what infants are concerned with. Food, warmth, love, affection. Basic needs.
Don't be afraid to shower you little guy with love and attention. It won't harm him. He will be secure in your love for him. That will give him confidence later. By the way.... at an age where seperation anxiety is typically at it's peak.... we don't have those issues. I know it's because my daughter is secure in the knowledge her daddy and I are always there for her and we will come back.
My sister is a social worker, we've talked about these things at length and there are many psychologists who agree with my parenting practices. So, I'm not just pulling this from out of the blue.
This is what worked for us. I know many people will just let them cry it out and feel that works for them. You have to choose what you believe is best for your family.. now and in the long term. I hope I've given you an option you will consider.
Congratulations on your little family!