A Study to Collect Data to Build Artificial Intelligence Derived Algorithms for Estimating Iron Status of Children

Inclusion Criteria: 1. Children above 6 months of age and below 6 years of age 2. Written consent from parent(s) or legally acceptable representative(s), who themselves are aged ≥ 21 years old, to consent and comply with the terms and conditions of the study 3. Parent(s) should have access to the internet and a smartphone or tablet to complete study questionnaires 4. Parent(s) should be able to comprehend the content of the study and complete the study questionnaires 5. Parents(s) must be comfortable with their child having blood draws 6. Subject has a Hb level corresponding to a Hb group with open slots for participation Exclusion Criteria: 1. Children with any medical condition that in the opinion of the investigator would not be suitable for enrolment. 2. Children with nail bed obstructions, nail polish, nails discolouration (e.g., leukonychia, melanonychia, bruising, etc.), or scarring of the lips, pigmentations on lips for thyroid dysfunction (e.g., Puettz-jeghers syndrome). 3. Children who are unable to cooperate with study procedures. 4. Employees and/or children/family members or relatives of employees of Danone Global Research \& Innovation Center or the participating sites.