Calculating which week of pregnancy you are in is a weird thing. One doesn't begin counting from the day you ovulate (which would make sense and would give the true age of baby), but from the first day of your last period.
The problem with this calculation is that it's usually based on a 28 day cycle which consists of 14 days from CD 1 to day of ovulation, and 14 days from day of O to day before your next period begins. This usually means that if your cycles aren't exactly 28 days long, the medical way of determining your week of pregnancy is always inaccurate.
Eg, like me - the first part of my cycle is 21 days long and the second part after O is about 13 or so. So by the time I'm already a week late for AF, baby is actually 6 weeks old (if I count from the first day of my last period), but the doctors will tell me that I'm only 5 weeks along (which is what happened with my last pregnancy), BUT baby is actually only 3 weeks old. Told you is was confusing. :P
It's just silly IMO. So I'm calculating my baby's age from the day of ovulation when conception occurred (so the "medical" age will always be 2 weeks more). This also means that baby's gestation is actually only about 38 weeks, and not really 40 weeks, because the first 2 weeks baby didn't even exist yet.
So baby's age is generally calculated from week 3 (which is actually week of conception), which means that at week 4 it actually means that baby is only 2 weeks old. So here goes . . . !
Week 3 (1st trimester)
Day of egg fertilization. Baby is about the size of a grain of salt and is too small to weigh.
Baby is about the size of a poppy seed and still to small to weigh.
Baby is about the size of a sesame seed and weighs less than 1 gram.
Baby is about the size of a lentil and still weighs less than 1 gram.
Size: blueberry (1.3cm) Weight: 1 gram.
Size: raspberry (1.6cm) Weight: 1 gram still.
Size: grape (2.3cm) Weight: 2 grams.
Size: kumquat (3.1cm) Weight: 4 grams.
Size: small lime (4.1cm) Weight: 7 grams.
Size: plum (5.4cm) Weight: 14 grams.
Size: nectarine (7.4cm) Weight: 23 grams.
Size: lemon (8.7cm) Weight: 43 grams.
Size: apple (10.1cm) Weighs about 70 grams.
Size: small avocado (11.6cm) Weight: 100 grams. (ooh, weighs as much as a slab of chocolate)
Size: turnip (13cm) Weight: 140 grams.
Size: green pepper (14.2cm) Weight: 190 grams.
Size: mango (15.3cm) Weight: 240 grams.
Length: banana (16.4cm) Weigh: 300 grams.
Length: large carrot (26.7cm) Weight: 360 grams.
Length: large baby marrow (27.8cm crown to heel) Weight: 430 grams.
Length: spring onion (28.9cm) Weight: 501 grams.
Length: sweet corn (30cm) Weight: 600 grams. Baby's still long and lean and hasn't began packing on fat and weight yet.
Week 25
Length: long eggplant (34.6cm crown to heel) Weight: 660 grams.
Length: average cucumber (35.6cm crown to heel) Weight: 760 grams.
Size: cauliflower (36.6 crown to heel) Weight: 875 grams. Baby's really picking up some weight now!
Size: chinese cabbage (37.6 cm) Weight: 1kg & 5 grams.
Size: butternut (38.6cm) Weight: 1kg & 153 grams.
Size: cabbage (39.9cm) Weight: 1kg & 319 grams.
Size: 4 large oranges (41.1cm) Weight: 1kg & 502 grams.
Size: spaghetti squash (42.2cm) Weight: 1kg & 702 grams. (never heard of a spaghetti squash before...)
Size: pineapple (43.7cm) Weight: 1kg & 918 grams.
Size: cantaloupe / melon (45cm crown to heel) Weight: 2kg & 146 grams.
Size: honey melon (46.2cm crown to heel) Weight: 2kg & 383 grams.
Size: casaba melon - whatever that is! (47.4cm) Weight: 2kg & 622 grams. Baby can safely be born now and should do just fine.
Size: whatever spinach-y thing that is below (48.6cm) Weight: 2kg & 859 grams.
Length: leek (49.8cm) Weight: 3kg & 83 grams.
Size: small watermelon (50.7cm) Weight: 3kg & 288 grams.
Week 40
Size: small pumpkin (51.2cm crown to heel) Weight: 3kg & 642 grams. Baby is finished!!
For the sake of your comfort, hopefully baby doesn't hang around in your belly until then! :)
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