Alexander Alber · Interactive tools · 2026 · in German
A set of interactive visualizations for nerd parents, around the topic of pregnancy and early childhood. The tools are in German and use publicly available clinical data.
Symptom timeline across pregnancy weeks
Maps 28 pregnancy symptoms as frequency-weighted bands across all 40 weeks. Also risk curves for miscarriage probability and premature birth survival. Data from NICHD 2013–18, Vermont Oxford Network, Magnus 2019, and Tong 2008.
Open tool →Developmental milestones and WHO growth curves, 0–48 months
Visualizes 49 developmental milestones across five domains (gross motor, fine motor, language, cognition, social-emotional) showing typical onset, peak, and boundary. Overlaid with WHO percentile growth charts for weight and height, with optional input of current measurements. Sources: CDC/AAP 2022, WHO-MGRS, Michaelis et al.
Open tool →Honest distributions across the first year, 0–12 months
Three stacked panels with a shared time axis: total sleep and longest continuous night stretch, feeding frequency (breast vs. formula), and crying and fussing duration per day. Bands show P10–P90 and P25–P75 with a median line. Sources: Iglowstein 2003 (sleep), Henderson 2010 (night stretch), Kent 2006 / AAP (feeding), Wolke 2017 and Vermillet 2022 (crying).
Open tool →Interactive planner for German parental leave benefit strategies
A month-by-month grid covering 24 life months, letting both parents independently assign Basis, Plus, or Partnerschaftsbonus months by clicking cells. Calculates total payout, joint months at home, and budget consumption in real time. Validates against current rules (April 2024 reform). Includes three preset models and slider inputs for net income.
Open tool →Probability distribution of the birth date, not just a point estimate
Models the birth date as a normal distribution with an evidence-based expected due date and confidence intervals. Supports three dating methods (LMP, ultrasound, IVF/ET) and optional corrections for parity, prior preterm birth, height, BMI, ethnicity, and fetal sex. Key message: the 80% window is roughly three weeks wide, and Naegele's rule is systematically 3 days early. Sources: Smith 2001, Mongelli 1996, Olsen & Clausen 1998, Myklestad 2013, Patel 2004, Phillips 2017, and others.
Open tool →