Hi hon.

Nothing to worry about - as you can see on the report, there are "normal" values. My baby was under the smallest value of normal at the first scan, and is now bigger than normal, although still in the normal range. Babies in utero have growth spurts, just like babies after they've been born.

For the first 13 or so weeks, babies do grow uniformly. After that, the whole genetic thing takes over - after all, every baby measures and weighs differently at birth, that difference starts remarkably early! The early uniform growth (sorry, skip this bit if you're not interested - it's all sciency stuff) is because of cell division: the original zygote doesn't grow in size at all for the first 10 days after conception, but just increases the cell count. After that, the cells grow and form the little blob, as well as getting ready to differentiate into the organs. A zygote has omnipotent cells (the cell can be anything), an embryo multipotent cells (the cells can be 3-4 different things) and a foetus mostly unipotent (the cells are one thing only). So once the cells are laid down as "lung cell" or "muscle cell" or whatever, the genetics takes over as to the actual size of those organs and the cell doubling rate. It really is exciting! However, this is the potential of the baby: if you are on a diet then the baby has restricted nutrients, so won't grow so big. This is why it's daft to diet in pregnancy, unless there's a medical reason and you're seeing a dietician. Same as with a child - you can cut out junk food, but a child shouldn't actually restrict calories. (BTW, I'm sure my DH should be taller from what his mum said about the fact that he was always moaning he was hungry as a teen, but she doesn't hold with keeping snacks in the house so he went hungry.) Anyway, I'm tall so I'm thinking it's normal that my baby's tall at this point. You're small, so it's normal that your baby is small.

The other thing is that you may be one week less along than you think you are - unless you know exactly when you ovulated, this is possible. If you know your date of ovulation then you can be sure that your baby is just either waiting for a growth spurt or is just a bit small right now.

Hope that reassures you somewhat!