Newborn babies rely on being held by their mother to coregulate. The sound and rhythm of their heartbeat and breathing being familiar from the womb and being held closely replicates the feeling of being in the womb. So doing activities sitting on your lap when he is calm is a good way to start this off. These can include reading books, feeding him (I fed my AD breakfast cereal everyday sitting on my lap until she was 3.5) and drawing (magma doodles are great). If you don't already have something in his bed that smells strongly of you then I'd recommend you do so. If you have a good photo of the two of you together a photo cushion is great. These things will help him become familiar with the sound, feel and smell of you making it easier to accept comfort. Swimming is another great activity for developing trust and physical closeness.
Our most successful calming and coregulation strategies are as follows:
Change of scene. For this one we go somewhere else when the behaviour (for want of a better word) starts. So if she woke up crying I'd take her out of her room and downstairs for a cuddle and some milk. We' often go for a little walk around our estate with me carrying her. We live somewhere safe and so have done this in the middle of the night when all else fails.
Milk in a baby bottle or these days through a straw. Sucking is soothing and so is drinking milk. This a strategy we use when she's started to calm - too soon and it gets thrown across the room! Even now I keep milk in a beaker on stand by at night just in case. She drank out of a baby bottle until just under 3.5 when she started biting through them every time she had one.
Having a script. When you know what the cause is and it happens regularly, script a response that you use each time. We've had various ones since LO came home from 'see you in the morning when the (gro glow) clock turns yellow with the sun' to ' daddy loved you and you'll see him in the morning, he won't leave without giving you a kiss'.
Bed sharing. It's not for everyone. We got a cot side and put it on our bed so we didn't have to worry about her falling off in the night and she had her own blanket for a long time so she didn't overheat under mine covers. The rule is she starts in her own room unless she's ill or hysterical but is welcome in with me any time once I've gone to bed.
Acknowledging the emotion and giving permission to feel it. Being told it's ok to be upset, to be angry, to grieve sends a powerful message.
Physical activity. Along with walking, our LO finds her indoor and outdoor trampolines, her peanut ball, swinging and being able to climb to be soothing.