1) WHO recommends a longer recall period (children born in the last 24 months); however, for the sake of greater precision, IndiKit proposes a shorter period of 12 months only (however, if your data needs to be comparable to the official statistics using a 24 months recall period, follow this standard).
2) This indicator relies on accurate age assessment. Since people often do not remember the exact dates of their children’s birth, the data collectors should always verify the child’s age. This can be done by reviewing the child’s birth certificate, vaccination card or another document; however, since many caregivers do not have such documents (and since they can include mistakes), it is essential that your data collectors are able to verify the child’s age by using local events calendars. Read FAO’s Guidelines (see below) to learn how to prepare local events calendars and how to train data collectors in their correct use.
3) Most likely, the sampling of your survey will be representative for "households with children aged 0 - 59 months", not for "0-12 months", resulting in a lower representativeness of data for this indicator (as only part of your sample will be children aged 0-12 months). Unless you have a separate (representative) sample for this age group, the best thing you can do is to ensure that your survey uses a larger sample of respondents (e.g. by using 95% confidence level and 4 - 4.5% margin of error).
