Data from the first two waves of the Fragile Family and Child Wellbeing study indicate that infants who look like their father at birth are healthier one year later. The reason is such father–child resemblance induces a father to spend more time engaged in positive parenting. An extra day (per month) of time-investment by a typical visiting father enhances child health by just over 10% of a standard deviation. This estimate is not biased by the effect of child health on father-involvement or omitted maternal ability, thereby eliminating endogeneity biases that plague existing studies. The result has implications regarding the role of a father’s time in enhancing child health, especially in fragile families.
Homo sapiens sapiens is one of those species where paternal investment in offspring is important.
Thus why the kafeeklatch of women surrounding the new mother continually bray “How much his father” he looks. Whatever the reality or the evidence.
It might also be a hint as to why serial motherhood isn’t all that good a solution. Despite the potential advantages of having children with a greater genetic mix.