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1st Trimester

2 weeks after conception
(4 weeks after the last menstrual period)

2 week picture not available at this time;
see 3 week picture below

Actual size = 1/100 of an inch long (.254 millimeters),
about the size of a period at the end of a sentence
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3 weeks after conception
(5 weeks after the last menstrual period)

3 weeks after conception
© Nilsson

Actual size = 1/10 of an inch long (2 millimeters),
about the size of a "dash" (i.e., - ) printed on this page
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6 weeks after conception
(8 weeks after the last menstrual period)

6 weeks after conception
© Nilsson

Actual size = 1/2 to 5/8 inches long from crown to rump (15.88 millimeters),
about the size of a jelly bean
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10 weeks after conception
(12 weeks after the last menstrual period)

10 weeks after conception
© Nilsson

Actual size = 2 1/2 inches long from crown to rump (63.5 millimeters),
about the size of a lime
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