Probably, your MIL thinks that if then kid would only want to be breastfed and what will she do when you will not be around. Say, if he is used to having your milk when you come home, but if by chance someday you get late in office, then it will be difficult for her to manage the child.
You can latch him on the next feed after coming home. Also, try making your MIL understand that you want to feed him to strengthen the bond with your baby, and breast feeding does that. On Sundays, you can read some research saying this, or can show her a video showing this. And if you do not want to tax yourself so much, you can simply tell your husband your point of view and he can communicate that to his mother in his own way. Let the son handle the situation.
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