G. Lippe, L. Galzigna, M. Francesconi, C. Zorzi and R. Deana (1982). Age-dependent excretion of 3-hydroxy-3-methylglutaric acid (HMG) and ketone bodies in the urine of full-term and pre-term newborns. Clinica chimica acta; international journal of clinical chemistry, 126(3), 291-5. https://doi.org/10.1016/0009-8981(82)90303-5

PubMed 6185254

[Abstract]
Total ketone bodies and 3-hydroxy-3-methylglutaric acid (HMG) were determined in urines of full-term and pre-term newborns from the first day after birth to an age of 17. Significantly higher levels of the two catabolites were observed in the first two weeks of life of the pre-term newborns. A peak of excretion of both ketone bodies and HMG was found between the 7th and the 10th day after birth in both groups of newborns. After the 3rd month there is no significant difference between full-term and pre-term children as far as the excretion of the two analytes is concerned.