Dealing with missing data in a longitudinal study

I am doing research on the association of 3 stress scales in pregnant women, one-by-one with an ACE questionnaire(Chronic stress).

The 3 stress scales are my responses which have done in two time points of pregnancy as a longitudinal study, but the ACE questionnaire ( my predictor) was done only once at the first time point. All the observations in ACE are complete but for 3 responses we have missing data. ( some of them didn’t show up in the second time).

I would like to know which method would be proper to deal with missing data.
Any suggestion will be appreciated.

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