I had my son 19th March 2016 - I was expressing for 4 weeks as he had an operation and was in hospital and got to used to bottles - then I had an infection and had antibiotics so I had to stop giving him my milk - anyway - he's now nearly 5 months and my breasts start tingling when he's hungry - like they did when I was expressing for him! I haven't leaked any milk and this has only been happening for 2 weeks? Any ideas?