Hi Ousaima,
there are several ways to get answers "from the field" or from the unconscious. Like I named regression/time-line work or kinesiology. Actually, I talked a little about kinesiology in the Medulla video. Perhaps there are some practitioners or trainers here that would like to give us a taster?
However, while you can choose to find answers for yourself with these methods, you can only use them with your kids if they are curious about it. If someone already has a strong opinion or resistance, the results will be skewed.
Did you ever ask your daughter if she remembers how she started hating bananas from one day to the next?