Babies are smart little creatures who are very intuitive. The more stressed out you are, the more stressed out they become. They pick up on our moods and that sometimes becomes too much for a new one to bear.
When you have the time, try to talk to your hubby about looking at things from a baby's perspective. My hubby too had a hard time with Eva when we bought came back from the hospital. He found it hard to take care of her and calm her down. In fact, her crying drove him bonkers so much so that sometimes he would get so fed up, put her down and leave the room.
A lot of men, especially first time fathers, aren't built like us women. A lot of women can be patient dealing with a crying baby but a father can take longer. Logic is part of the problem; lack of initial bonding is another.
Because I've had a head start with taking care of Eva, I also share my tricks and tips with my hubby and we try to talk about sharing the same perspective on a number of things. This way, he will find it easier to care for Eva and Eva will find the transition from mummy to daddy easier.
dont't worry about chubby baby being too chubby. When they start crawling (and after the 4th month), their weight gain will be very slow and with some babies, they'll start to lose weight.
Please tell your hubby to stop the shaking. It is not good for a baby's still weak neck and head. Imagine if someone shook you like crazy...how would you feel? Your neck would be totally sore, right? So really, get him to stop that. If he cannot tahan carrying Louis when he's crying, then take over from your hubby. If you both cannot tahan, then put Louis down and take a breather for a few minutes. Those precious few minutes can save you both from doing something you may regret.
Also, does your hubby have any male friends with children or babies? Maybe he can talk to them about what he's going through? I encourage my hubby to contact his close friend who has a toddler and they can spend hours talking about all sorts of baby-related stuff.