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Hypercalcaemia presents clinically with a range of symptoms including failure to thrive, poor feeding, constipation, polyuria, irritability, lethargy, seizures and hypotonia. When hypercalcaemia is suspected, an accurate diagnosis will require an evaluation of potential causes (e.g. family history) and assessment for physical features (such as dysmorphology, or subcutaneous fat deposits), as well as biochemical measurements, including total and ionised serum calcium, serum phosphate, creatinine and albumin, intact parathyroid hormone\u00a0(PTH), vitamin D metabolites and urinary calcium, phosphate and creatinine. The causes of neonatal hypercalcaemia can be classified into high or low PTH disorders. Disorders associated with high serum PTH include neonatal severe hyperparathyroidism, familial hypocalciuric hypercalcaemia and Jansen\u2019s metaphyseal chondrodysplasia. Conditions associated with low serum PTH include idiopathic infantile hypercalcaemia, Williams-Beuren syndrome and inborn errors of metabolism, including hypophosphatasia. Maternal hypocalcaemia and dietary factors and several rare endocrine disorders can also influence neonatal serum calcium levels. This review will focus on the common causes of hypercalcaemia in neonates and young infants, considering maternal, dietary, and genetic causes of calcium dysregulation. The clinical presentation and treatment of patients with these disorders will be discussed.<\/jats:p>","DOI":"10.1007\/s00467-021-05082-z","type":"journal-article","created":{"date-parts":[[2021,5,14]],"date-time":"2021-05-14T20:02:40Z","timestamp":1621022560000},"page":"289-301","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Genetic causes of neonatal and infantile hypercalcaemia"],"prefix":"10.1007","volume":"37","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1361-9174","authenticated-orcid":false,"given":"Caroline M.","family":"Gorvin","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,5,14]]},"reference":[{"key":"5082_CR1","doi-asserted-by":"publisher","first-page":"E1946","DOI":"10.1210\/jc.2013-3105","volume":"98","author":"JD Roizen","year":"2013","unstructured":"Roizen JD, Shah V, Levine MA, Carlow DC (2013) Determination of reference intervals for serum total calcium in the vitamin D-replete pediatric population. 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