The best site to inject intramuscularly for small children is the vastus lateralis. It is located at the anterior lateral view within the middle or upper thigh region.
The vastus lateralis is considered the safest site to inject intramuscularly at birth and until 36th month of age; wherein it has an appropriate muscle mass for the needle to penetrate enable to reach in the muscle tissue. Needle to be used must be gauge ranges from 23-25 in 7/8" to 1" in size. All infant will undergone intramuscular injection and it is this site recommended that the drugs should be administered; such as the hepatitis vaccine, and the diphtheria, polio and tetanus vaccine.
When the child reach beyond 36 months of age, deltoid muscles already become dense and massive. It is located above the armpit just the border end of both sides of shoulder. In this site, the intramuscular injection is already considered in administering drugs specifically the tetanus toxoid vaccine. Needle to be used will still be the same gauge range, 23-25 in a 1" to 2" in size.
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