How to you decide age
All this talk about stains solid foods has me confused about how you are supposed to determine age. We have been going by weeks (ex. 8 weeks = 2 months) but it didn't even occur to me until now that some people go by the actually month (Sept 11 = 1 month, oct 11 = 2 months, etc). How did you determine what was actually the 4 or 6 month mark?