For investigation of the effect of timing of the first and second dose of DTaP-IPV-Hib with or without PCV, a Binary regression model will be used to estimate the adjusted relative risk of developing atopic dermatitis from baseline (age for categorized timely vaccination) until one year of age, among delayed vaccinated compared to timely vaccinated children. The analysis will include all abovementioned potential confounders. Absolute risk differences will be reported if relevant.