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Home > Maternity Bra Fitting Guidelines


Throughout pregnancy, the breasts undergo substantial changes in fullness. The breast consists of fatty and connective tissue and glands enclosed in the skin. It has no muscles itself, but does sit on top of the muscular system.

Each breast becomes 300-500 grams (0.66-1.1 lbs.) heavier during pregnancy as the mammary glands grow and tissue fluid is stored. This puts the surrounding skin and tissue under considerable strain.

If the breast is not adequately supported, this can lead to deformation and, in the case of large breasts, tension in the shoulders and neck area.

Why a Maternity Bra?

A maternity bra is recommended for wear instead of a regular bra for the following reasons:

  • it expands with the breasts without cutting into the skin
  • it has an integrated support system for the expanding breast
  • it minimizes and even helps to prevent stretch marks and deformation of the breast
  • it is made from materials specially selected for comfort, preventing irritation of sensitive breasts
  • its wide, softly padded straps ease strain on the shoulders and neck

When Should I Start Wearing a Maternity Bra?

The best time to start wearing a maternity bra is when your existing bras no longer fit or from the 4th month onwards.

Adjustment of Maternity Bra from 4th Month Onwards

At month 4, the bra should be fitted so that it is comfortable and does not dig in even on the tightest setting. The breast should be fully enclosed by the cup on both sides and at the decollete. The underbust band can be widened twice during the course of pregnancy. The cup expands with the breast.

If the bra is correctly adjusted, it can be worn right through to the end of pregnancy.

If you have any trouble finding your correct bra size and would like to speak to one of our caring, experienced Certified Fitters at MetroMedicalOnline.com call 1.866.774.9513.

Your Band Size Measurement :

Without a bra on, measure around your body directly under the bustline. If the measurement is an odd number, add 5 inches. If it is even, add 4 inches. This is your band size. You can refer to the last chart on this page to help you find your band size.

Your Cup Size Measurement:

Without a bra on, measure around the fullest part of your breast. The resulting difference equates to your cup size as follows:

Difference of:Cup Size:
1 inchA Cup
2 inchesB Cup
3 inchesC Cup
4 inchesD Cup
5 inchesDD Cup
6 inchesDDD or E Cup
7 inchesF Cup
8 inchesG Cup
9 inchesH Cup
10 inchesJ Cup

Determine Your Bra Size By How Your Current Bra Fits:
  • If your bra rides up in the back:
    You need a smaller band size
  • If your band digs in:
    You need one band size larger
  • If your cups overflow:
    You need one cup size larger
  • If your shoulders ache:
    Loosen your bra or opt for a bra with wider or cushioned straps (See Strap Accessories)
  • If your bustline sags:
    Shorten the straps, avoid stretchy fabrics, or choose a firmer support style with rigid straps
  • If your straps slip:
    Tighten your straps or opt for a bra with wider straps
  • If the underwire pinches or pokes you:
    The cup size is wrong and you need to try a size smaller or larger

Under Bust Circumference (in inches):Band Size:Bustline Circumference (in inches):Cup Size:
27-283233
34
35
36
37
38
39
40
41
B
C
D
DD
E
F
G
H
J
29-303435
36
37
38
39
40
41
42
43
B
C
D
DD
E
F
G
H
J
31-323637
38
39
40
41
42
43
44
45
B
C
D
DD
E
F
G
H
J
33-343839
40
41
42
43
44
45
46
47
B
C
D
DD
E
F
G
H
J
35-364041
42
43
44
45
46
47
48
49
B
C
D
DD
E
F
G
H
J
37-384243
44
45
46
B
C
D
DD

 
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