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I read your query and can understand your concern.
In general, babies develop at different rates and exhibit varying behaviors, and it is normal for them to have different levels of eye contact and responsiveness at different times. Some babies may make more eye contact and smile more frequently than others, while some may be less consistent in their behavior. It is also common for babies to show interest in toys and other visual stimuli, such as mobile video calls, as their visual tracking abilities develop.
As MRI (magnetic resonance imaging) and EEG (electroencephalogram) are normal, it is important to get regular consultations with your treating doctor for a detailed evaluation of your child's growth and development and have further management accordingly.
Hope this helps.
Thanks and take care.