Fetal development timeline
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The transformation from a tiny fertilised egg to a fully-formed baby is an incredible process.
When you’re pregnant, it can be exciting and moving to think about what your baby’s getting up to in there. From his first heartbeat to the day he’s ready to enter the world, here are the major milestones your baby will reach while he’s still in your womb (uterus).
Of course, every baby is different, so these timings are just a guideline.
First trimester
Three weeks
When egg meets sperm, the ferti...
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