Title {1}	Effect of targeted vs standard fortification of breast milk on growth and development of preterm infants (≤ 32 weeks): a randomized controlled trial.
Trial registration {2a and 2b}.	Clinicaltrials.gov (NCT03775785). WHO trial registry items can be found within the body of the protocol.
Protocol version {3}	version 2. 28.02.2019
Funding {4}	This work was supported by Nutricia Research Foundation, grant number RG 4/2018.
Author details {5a}	Joanna Seliga-Siwecka MD, PhD Neonatal and Intensive Care Department, The Medical University of Warsaw, Warsaw, Poland Anna Chmielewska, MD, PhD Department of Clinical Sciences Umeå University, Sweden Katarzyna Jasińska, MD Neonatal and Intensive Care Department, The Medical University of Warsaw, Warsaw, Poland
Name and contact information for the trial sponsor {5b}	The Nutricia Foundation 6 Bobrowiecka street 00-728 Warsaw, Poland
Role of sponsor {5c}	The funder will not have any role during the study execution, analyses, interpretation of the data, or decision to submit results.