I am a working mother. I have resumed my job since a week. My lo is on expressed breastmilk and formula feed while I am away. But, when he is sleepy he keeps demanding breastfeeding and cries a lot. Here in Babychakra I read not to associate baby's sleep with breastfeeding,but it was too late,I had already made that mistake. What can I do now?! I am feeling very guilty.