Maybe the following studies will help you on the subject:
Bar-Yoseph R, Kugelman N, Livnat G, Gur M, Hakim F, Nir V1, Bentur L. Halotherapy as asthma treatment in children: A randomized, controlled, prospective pilot study. Pediatr Pulmonol 2017;52(5):580-587. https://onlinelibrary.wiley.com/doi/abs/10.1002/ppul.23621
Khan MA, Kotenko KV, Korchazhkina NB, Chervinskaya AV, Mikitchenko NA, Lyan NA. [The promising directions for the further development of halotherapy in pediatric medicine]. Vopr Kurortol Fizioter Lech Fiz Kult 2016;93(6):61-66. [Article in Russian] https://www.ncbi.nlm.nih.gov/pubmed/28635700
Sandu I, Canache M, Sandu AV, Chirazi M, Mihaescu T, Checherita LE, Sandu IG. The influence of NaCl aerosols on weight and height development of children. Environ Monit Assess 2015;187(2):15. https://link.springer.com/article/10.1007/s10661-014-4239-y
Sandu I, Canache M, Mihaescu T, et al. Influence of NaCl Aerosols on the Functional Characteristics of Children. REV CHIM (Bucharest) 2015;66(1):60-65. http://www.revistadechimie.ro/pdf/SANDU.pdf%201%2015.pdf
Khan MA, Khoruzhenko OV, Vakhova EL, Lyan NA, Radetskaya LI. [The role of non-medicamental technologies in the rehabilitation of the children presenting with acute rhinosinusitis]. Vopr Kurortol Fizioter Lech Fiz Kult 2015;92(4):36-40. [Article in Russian] https://www.ncbi.nlm.nih.gov/pubmed/26595967
Lazarescu H, Simionca I, Hoteteu M, Munteanu A, Rizea I, Iliuta A, Dumitrascu D, Dumitrescu E. Surveys on therapeutic effects of "halotherapy chamber with artificial salt-mine environment" on patients with certain chronic allergenic respiratory pathologies and infectious-inflammatory pathologies. J Med Life 2014;7 Spec No. 2:83-7. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4391365/pdf/SIJMedLife-07-83.pdf
Gelardi M, Iannuzzi L, Greco Miani A, Cazzaniga S, Naldi L, De Luca C, Quaranta N. Double-blind placebo-controlled randomized clinical trial on the efficacy of Aerosal in the treatment of sub-obstructive adenotonsillar hypertrophy and related diseases. Int J Pediatr Otorhinolaryngol 2013;77(11):1818-24. https://www.sciencedirect.com/science/article/pii/S0165587613003996?via%3Dihub
Canache M, Sandu I, Chirazi M, Lupaşcu T, Sandu IG. The Influence of the Saline Aerosols on the Staturo-Pondereal Growth and of some Functional Characteristics of the Children. Present Environment & Sustainable Development 2013;7(1):102-115. http://www.pesd.ro/articole/nr.7/PESDVOL7NR12013/09TIOTSAOTSPGAOSFCOC27052013101114.pdf
Snyetkova N, Kokten F. Influence of Halotherapy on Oxidant-Antioxidant Processes in Children with Dermato-Respiratory Syndome at the Period of Exacerbation of Atopic Dermatitis. Arch Dis Child 2012;97(Suppl 2):A144. https://adc.bmj.com/content/archdischild/97/Suppl_2/A144.1.full.pdf
Khan MA, Chervinskaia AV, Mikitchenko NA. [The use of halotherapy for the health improvement in children at institutions of general education]. Vopr Kurortol Fizioter Lech Fiz Kult 2012;(2):31-5. [Article in Russian] https://www.ncbi.nlm.nih.gov/pubmed/22908472