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Calculators & ToolsSep 5, 2026

BMI Before Pregnancy: Why It Matters and What It Changes

Your pre-pregnancy BMI is the input that sets your recommended weight gain, and it follows you through the whole pregnancy. Here's how the BMI bands map to the IOM targets, and where a single height-and-weight number stops being useful.

ProbaBaby Team6 min
PregnancySep 5, 2026

Caffeine During Pregnancy: How Much Is Safe? (The 200 mg Rule)

Almost every guideline lands on the same ceiling: under 200 mg of caffeine a day in pregnancy. Here's what that is in real mugs, cans and squares of chocolate — and how strong the evidence behind the number really is.

ProbaBaby Team11 min
PregnancySep 5, 2026

How Much Water Do You Need During Pregnancy?

ACOG says 8 to 12 cups a day, and the IOM sets an adequate intake of 3.0 L of total water for pregnancy. Here is where those numbers come from, and why your body weight, your activity and the weather matter more than your trimester.

ProbaBaby Team8 min
Calculators & ToolsSep 5, 2026

Pregnancy Weight Gain: How Much Is Right for You (IOM Targets by BMI)

There is no single right number for pregnancy weight gain — there are four, and the one that applies to you depends on your BMI before you conceived. Here are the IOM 2009 ranges, the weekly rates behind them, the separate twin numbers, and what the evidence actually says about gaining more or less.

ProbaBaby Team8 min
Twins & MultiplesSep 5, 2026

Twin Pregnancy Weight Gain: The IOM Targets by BMI

Twin pregnancy weight gain has its own targets, and they are not the singleton numbers doubled. Here are the IOM 2009 provisional ranges by pre-pregnancy BMI, why there is no range at all for underweight women, when in the pregnancy the gain actually matters, and what the research since 2009 shows about gaining below or above them.

ProbaBaby Team8 min
Baby & PostpartumSep 5, 2026

When to Start Solids: Readiness Signs, First Foods and How to Log Them

Guidelines put solids at around 6 months, but the calendar is only half the answer. Here are the readiness signs that actually count, safe first foods, how allergen introduction works, and what is worth writing down.

ProbaBaby Team8 min