Cotokim

Cotokim helps expecting parents in Brazil, the United States and Mexico plan the baby's layette. Tell it the city and, in Brazil and the United States, the month and year the baby is due, and it builds a checklist sized to the local climate in the first months: how many bodysuits, sleepers, socks and other items to have in each size, split into what to have before the birth, up to six months, and later. In Mexico it uses only the city and shows how the clothes change for each of the twelve birth months. The list opens as an interactive checklist in the chat, in English, Spanish or Portuguese.

It also answers practical questions with small calculators:

• how many diapers to have before the birth, by size, for one baby or twins (one baby in Mexico);
• how to dress the baby for a given room temperature, in °F or °C, with safe-sleep cautions from public health sources;
• clothing sizes by age, weight and length (Carter's labels in the US, local sizes in Mexico and Brazil);
• a hospital bag checklist for each country;
• the city's typical climate, month by month;
• in Brazil, how to split diaper sizes among baby shower guests.

What it uses: only the city and, in Brazil and the United States, the month and year the baby is due, never the exact date or any name, plus what each calculator asks (room temperature, number of guests, the baby's age, weight or length). Nothing is stored; only daily usage counts per tool are kept.

Coverage: 100 cities in the United States, 48 in Mexico and every municipality in Brazil. Quantities are planning estimates, not medical advice; for the baby's health, talk to a pediatrician. A printable version of the list opens on cotokim.com.