just wanted to add my 2 cents worth. firstly, congratulation on you little boy!!!

I remember those first few weeks with DD, she wouldnt sleep unless i was right there, i had her in a sling and would just walk around the park for hours while she slept, i swear i lost kgs too but sometimes when that wouldnt work she would just cry and cry, a few times i would just hold her and cry too!!!
The most important thing to remember is that things change so quickly in the first few months! you have had great advice here! hugs to you. xx