Break down the reason why we are taking special precaution on giving antibiotic and antibiotic dosage to elderly, pregnant women and infants. what are the general precaution

Why do we take special precautions on giving antibiotic and antibiotic dosage to elderly, pregnant women and infants. What are the general precaution.
Special precautions are taken while prescribing antibiotics to elderly, infants and pregnant women because some antibiotics are not suitable for their usage (Cleveland Clinic). Some of them turn out to be teratogenic such as streptomycin and kanamycin, hence should be avoided during pregnancy. For infants the dosages are lesser than the regular doses as they can be toxic to the infants if given on regular doses as they cannot be tolerated (BetterHealth). There is an increased...