The child's age is extremely important. Remember that children are those between birth and age 18.
It is of more importance to establish who weighs 150 lbs, the child or the mom.
Dr. Phil counseled the mother of a 150 lb 4-year-old.
In the given sentence, "Dr. Phil counseled the mother of a four-year-old who weighs 150 lbs," some people might argue that it specifically states the child's age, while others may not find it problematic. However, if you prefer to avoid mentioning the child's age, then it would be better to say, "Dr. Phil counseled the mother of a child who weighs 150 lbs." This version removes the reference to the child's age and focuses solely on their weight. Ultimately, the decision depends on how much detail you want to include in the sentence.
