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Infant or pediatric amino acids formula are recommended for the age under 18 months and strongly recommended for babies under the age of 6 months.
There are major differences between and infant or pediatric amino acids versus adults PN formula or we called standard amino acids and renal and hepatic amino acids formulas:
Infant or pediatric formula has the followings:
1-Low concentrations of methionine, phenylalanine, and glycine. Giving standard or adult amino formula what have very high concentrations of these amino acids and due to immature organ and enzymatic system, they lead to accumulation of these amino acids that have a potential harmful to the babies, like GI upset, affecting blood hemostasis, and possible brain damage.
2- It contains Taurine which plays a role in prevent cholestasis associated with PN and it is important for retinal development
3- It contains Cysteine which enhance the solubility of calcium and inorganic phosphate (if organic phosphate is not in use.

in case of a shortage, it was advised that the standard amino acids should NOT BE used for more than 3 days. There are many pediatric
formula options like Primine, Trophamine, Vaminolact, Aminoven infant in the market.
If PN is to be continued with adult amino acids, standard amino acids formula, you may continue with very low dose 0.5 gm/kg/day, even I Don’t like this approach.