One boob suddenly shrunk

[AnaisB]

ie gone from about a G cup to a DD (so the lopsidedness is very noticeable)

Why would this happen and more importantly how can I even them out again? I'm a bit worried that the small boob is drying up and I'm never sure if DD gets enough milk - although when I squeeze it milk comes out.

DD is 6.5 months old and was EBF without a problem until she was 6 months old when I introduced 1 FF a day. I have also gradually reduced the number of feeds she has per day (from 5 or 6 to 3 +1 FF).

One possible explanation is that for a few days I always started the morning feed with one boob - maybe she's hungrier in the morning? but would it make such a big difference in a few days?

Any ideas?