<s>[INST] I have a 3weeks old baby who only feeds on breast milk. Am worried because she looks dehydrated, tiny and malnourished unlike when she was born. She cries often and seems not to be getting enough breast milk. What do I do, do I introduce formula feed. [/INST] Hi, I had gone through your question and understand your concerns. You should be worried but not too much. You should introduce Nan or other if you would like and if baby don't gain weight. Start from 30 ml, add every day 30 ml. Give 90-100ml for 1 feeding. You can give Nan 1-2 times. Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health. </s>