babies cry from the moment they are born cause of the loss that they had to return to this physical world to make up for a sin they did in their previous life. as they get older-week by week- they cry less due to Hashem removing from their memory any reminder of what it was like in the olam Haemes with the avos etc…
may we all be fortunate to complete our missions in this world ASAP so we can be taken to the only real & true world above with seeing & feeling Hashems presence 24-7