Don't be upset. Stick to your own principles.
I used to breastfeed my baby for 10 months only. Everybody around me discourages me. It is very difficult 10 months for me. I quitted not because of their discouragement. Just because I need to work fulltime and really feel very tired.
You should be so proud of yourself since you have already passed one year and a half. I understand it is very hard for you but you have still made it.
But it is also time you should introduce more solid foods to supplement your breastfeeding now since your baby is already one and a half year old.
Do be upset!!
I used to have the same problem for the first few month in breast feeding my baby. Even my parent and HB also discourage me to continue, because my daughter cannot gain weight properly and I also do not have enough breast milk for her. So I have to mix up the cow milk.
Until she was almost 4 to 5 months, she get inflection from his father and 呵 for almost 5 to 6 times per day. The doctor said she cannot get anything except breast milk. It help her to getting better without taking too much medicine. The doctor said because I have anti-boby in the breast milk her.
In addition, I have some friends their babies have the problem of 濕疹 in drinking cow milk. When my HB met my friend's daughter she has very serious 濕疹 and suffered from the disease until now (almost 10 years old). He finally understood why I am so insist.
So don't give up and you won't be alone.
My daughter is still under weight, but she is healthy and all the physical development is OK. So I am not worry so much. As most of the doctors said, the weight and height of children are decided with the genetic factor.