

Once you can click and hold to drag the red/green/ blue square you can change width and the Height.

You can click the Orange Circle and hold to drag change the size

Though its the only the shape of Pregnancy so the belly button is not there you have to guess by it.
Material
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Default material
Allocate
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2 Months 5-8 week
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3 Months 9-13 week
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4 Months 14-13 week
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5 Months 18-21 week
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6 Months 22-26 week
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7 Months 27-30 week
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8 Months 31-35 week
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9 Months 36-40 week