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The Endocrine Disruption Exchange
From 2003 to 2019, TEDX produced and shared scientific evidence of endocrine disruption with nonprofit organizations, government agencies, and the public. Although we are no longer operating, our website resources will remain available.
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Critical Windows of Development Timeline

Medical DictionaryMedical DictionaryLEARNING MODULEStep 1: Normal Human prenatal development 

Click on a circled number to see a list of events in each week of prenatal human development. Learning module Answers

step 2: low-dose effects in lab animals

Choose one or more chemicals (right), then click on a circled number in the colored bars that appear. You will see research findings on the effects in lab animals from low-dose chemical exposure during the selected period of development. Note that the length of the colored bar reflects the overall duration of exposure in animals, and the numbers indicate how many research findings will be shown.

Normal Human Prenatal Development

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Low-Dose Chemical Research

Bisphenol A
Dioxin
Phthalates
Chlorpyrifos
PFAS
All Chemicals

View Subsystems

headerheader
Central Nervous System
Normal Human Development
2
1
9
10
12
5
2
2
3
1
2
5
1
3
2
1
1
1
2
1
2
Bisphenol A
24
13
12
6
4
1
1
2
3
4
1
Dioxin
7
3
8
3
27
2
3
2
1
Phthalates
2
1
3
Chlorpyrifos
3
6
12
4
24
1
1
2
50
3
2
43
PFAS
17
1
1
2
Female Reproductive System
Normal Human Development
1
4
5
3
2
7
2
5
5
1
3
1
2
1
3
1
2
1
1
3
2
1
1
5
Bisphenol A
6
9
17
2
3
1
2
1
1
1
2
Dioxin
2
2
2
4
20
1
2
Phthalates
2
Chlorpyrifos
1
PFAS
7
1
4
1
1
1
1
Male Reproductive System
Normal Human Development
1
2
2
5
4
1
3
1
4
1
1
1
1
2
Bisphenol A
1
9
1
9
2
2
1
1
3
Dioxin
4
4
1
3
61
3
1
1
2
1
Phthalates
1
2
1
1
PFAS
1
Endocrine System
Normal Human Development
9
14
10
8
13
7
6
10
4
10
6
1
3
2
1
1
1
1
2
1
1
3
Bisphenol A
4
4
6
1
1
Dioxin
3
6
8
47
2
3
1
2
1
2
1
1
1
1
Phthalates
5
2
1
1
Chlorpyrifos
1
1
1
1
PFAS
9
Immune System
Normal Human Development
1
2
2
2
3
1
3
3
1
2
1
1
1
2
Bisphenol A
1
Dioxin
2
3
4
4
14
1
1
2
2
Phthalates
1
Chlorpyrifos
2
1
PFAS
4
Other Systems
Normal Human Development
3
1
7
11
8
4
4
5
2
3
2
2
2
2
2
1
1
2
2
1
2
1
2
1
1
2
2
Bisphenol A
4
9
8
7
1
Dioxin
15
9
16
12
69
4
4
8
1
2
1
2
1
Phthalates
8
2
Chlorpyrifos
3
8
4
14
1
7
PFAS
48
2
6
1
1
2
1