Cepheus is getting distant

from me.  Previously when papa is not around, Cepheus will always stick to me.  However, ever since i gave birth to Calyce, Cepheus have changed his target and now stick to my MIL whenever papa is not around.  Of course, he still looks for me to play and read him books.. but whenever he wants comfort and carrying he will seldom come to me nowadays.  I have been informing Cepheus that Mommy cannot carry him when Calyce is born but can only hug hug him prior to Calyce birth when i am still carrying him around and he seems to understand that, and always tell me OK OK.  Now when Calyce is born, i am not sure if he really understands what i have told him prior that is why he do not insist on me carrying him now when he previously does.  Only at times when he starts to cry and he forgets that i cannot carry him, he will cry for me to carry him.  But when i do not carry him he will ran to my MIL or Papa for comfort.  At times i think that he really does understand as he will at times tell papa that mommy pain pain and cannot carry him, which makes me comforted.  However, his actions made me felt neglected as well.. as i always tell him to 'hug hug' and he refuse he only wants 'bao bao' when i say remember mommy say cannot 'bao bao', then he will ran to papa or MIL for 'bao bao'.. my MIL said that Cepheus is very smart as he knows who to go to get what he wants.. when he wants to read, he ask for mommy, when he wants to carry, he ask for papa and granny.. However, is he too smart for us?  At times, he will suddenly ran to me and put out his hands (his usual indication of bao bao) and then he will pause think twice, seems like he suddenly remembered that i cant carry him and then ran away again..  This makes me sad and wonder why cant he just 'hug hug' me but insist on 'bao bao'.. i also have friends who gave birth to younger ones but their elder ones still shows affection towards their mommies who have been loving and taking care of them all the while.. however, cepheus attitude changes once mommy cannot carry him.. which makes me very sad.. is this how a child should behave?  Why cant he love me the same when i cant carry him around and why cant he show me comfort and reassurance that he still loves me although i cannot carry him anymore? I have been telling him everyday that mommy still loves you and he always reply with a loud OK.  But why cant he do the same to me and assure me that he still loves me..