Today, 02:04 PM
Baby is what- about 2 or three weeks old now? That is the age a baby typically kind of "wakes up" and starts nursing like mad, wants to nurse all the time, and cries if they are taken off the breast. I do not know what is going on with your child's milk intake, but I am just saying, what you are describing would describe many babies at this age, even those gaining very rapidly It does NOT mean your child is suffering.
Let's imagine, for the sake of argument, that you never make enough milk, and baby continues to need supplements as a result. There is great value to breastfeeding no matter how much baby gets 'exclusively' at the breast. As long as baby is supplemented if and as needed, breastfeeding can continue with no harm, no suffering, and no starving, and only with benefit to your child.
A good book that addresses the situation you are facing is Making More Milk. Yes it addresses in detail milk production issues, why they happen and what to do about it, but it also includes much insight, real world coping suggestions, (how to nurse, supplement and pump without losing what is left of your mind, etc.) and encouragement for the mother who is facing the difficult situation of a baby who is not gaining normally at the breast. I strongly recommended it.