Di/Di (often written “didi”) twins are a type of twin pregnancy where each baby has its own placenta and its own amniotic sac; medically this is called dichorionic‑diamniotic twins.

What Are “Didi Twins”?

  • “Di” = dichorionic → two separate placentas.
  • “Di” = diamniotic → two separate amniotic sacs.
  • Put together, didi twins means two embryos growing side‑by‑side in the same uterus, but each in its own “apartment” with its own support system.

These are the most common and generally lowest‑risk type of twin pregnancy, because the babies are not sharing a placenta or sac, which reduces certain complications.

Are Didi Twins Identical or Fraternal?

  • Didi twins can be fraternal (dizygotic) : two different eggs, two different sperm, two placentas, two sacs. This is the classic “non‑identical” twin setup and makes up the majority of di/di pregnancies.
  • They can also sometimes be identical (monozygotic) if a single fertilized egg splits very early (around days 1–4), early enough that each twin develops its own placenta and sac.

All fraternal twins are di/di, but not all di/di twins are fraternal; a notable minority are actually identical.

Quick Facts (Forum‑Style “Scoop”)

  • Most common twin type and often described by doctors simply as “di/di twins” on ultrasound reports.
  • Considered the “safest” form of twin gestation since separate placentas mean lower risk of issues like twin‑to‑twin transfusion syndrome.
  • Can be boy–boy, girl–girl, or boy–girl; boy–girl pairs are always fraternal.
  • Often discovered at an early ultrasound when the sonographer sees two gestational sacs and two placentas (or one fused placenta behaving like two).

A simple way to picture them: imagine two babies each in their own water balloon, each with its own “lifeline” to the uterus—close together, but not sharing the same bubble.

TL;DR

Didi twins = dichorionic‑diamniotic twins : two placentas, two sacs, most common and generally lowest‑risk twin type, and they can be either fraternal or (less often) identical.

Information gathered from public forums or data available on the internet and portrayed here.