On the Editing page, scroll down until you see "Your First Moments" heading on the left side.  Now, the photos that are already picked are visible and have a green tick on their lower right side. The photos that are not selected are greyed out. If you want to unselect a photo, simply click on the green tick icon and it will make that photo greyed just like the rest of the unselected photos. You can now select your desired photo by clicking on the already greyed out photos. If you want to browse for more photos in this section, click on the "Forward" button located on the top right of this section. Remember, you should select 3 photos from this section. The number of selected photos is displayed right next to the section heading.

Summary: Go to “Your First Moments” section. Unselect a photo. Select a photo. Browse for more photos.


You can do this as you would normally, listening to music on a stereo or through the speakers of your car. Avoid putting headphones directly on your stomach, as this can overstimulate your unborn child. The recommended volume for your child to best enjoy music that you play should be at about the level of the ambient noise made by a washing machine.  Children begin to hear and make sense of sound in the womb at about 25 weeks into your pregnancy.  Exposing your child to music in the womb does not guarantee that your child will be mathematically inclined or musically apt. But by engaging your child with sound, you give it practice at discerning differences in it. Simple melodies will be less overwhelming for your child. Consider songs you might put your baby to sleep with, or childhood songs like: The ABC songYou are my SunshineHush Little BabyTwinkle Twinkle Little Star Children can recognize the voices of parents and other family members that it has heard while in the womb. By talking to your baby or reading them books, you will help them begin learning about sound while still in the womb. Different languages follow different rules of stress and intonation. Studies have shown that your newborn will have the ability to identify their native tongue, so they might benefit from being familiarized with other languages. You might consider:  Watching foreign films. Sitting in on classes teaching language. Doing light volunteer work with an ethnically oriented outreach program. While it is unlikely that your child will learn the song you are singing in the way young children or adults do, familiarization with common childhood songs may encourage their learning of it after being born. There are many songs for you to choose from, including:   One Two, Buckle my Shoe One Potato, Two Potato Three Little Piggies Months of the Year Song

Summary: Play music. Talk to your baby while you are pregnant. Find a multilingual environment. Sing educational songs.


" Technically, there is no such thing as matrix division. Dividing a matrix by another matrix is an undefined function. The closest equivalent is multiplying by the inverse of another matrix. In other words, while [A] ÷ [B] is undefined, you can solve the problem [A] * [B]-1. Since these two equations would be equivalent for scalar quantities, this "feels" like matrix division, but it's important to use the correct terminology.  Note that [A] * [B]-1 and [B]-1 * [A] are not the same problem. You may need to solve both to find all possible solutions. For example, instead of (13263913)÷(7423){\displaystyle {\begin{pmatrix}13&26\\39&13\end{pmatrix}}\div {\begin{pmatrix}7&4\\2&3\end{pmatrix}}}, write (13263913)∗(7423)−1{\displaystyle {\begin{pmatrix}13&26\\39&13\end{pmatrix}}*{\begin{pmatrix}7&4\\2&3\end{pmatrix}}^{-1}}.You may also need to calculate (7423)−1∗(13263913){\displaystyle {\begin{pmatrix}7&4\\2&3\end{pmatrix}}^{-1}*{\begin{pmatrix}13&26\\39&13\end{pmatrix}}}, which may have a different answer. To take the inverse of a matrix, it must be a square matrix, with the same number of rows and columns. If the matrix you're planning to inverse is non-square, there is no unique solution to the problem.  The term "divisor matrix" is a little loose, since this is not technically a division problem. For [A] * [B]-1, this refers to matrix [B]. In our example problem, this is (7423){\displaystyle {\begin{pmatrix}7&4\\2&3\end{pmatrix}}}. A matrix that has an inverse is called "invertible" or "non-singular." Matrices without an inverse are "singular." To multiply two matrices together, the number of columns in the first matrix must equal the number of rows in the second matrix. If this does not work in either arrangement ([A] * [B]-1 or [B]-1 * [A]), there is no solution to the problem.  For example, if [A] is a 4 x 3 matrix (4 rows, 3 columns) and [B] is a 2 x 2 matrix (2 rows, 2 columns), there is no solution. [A] * [B]-1 does not work since 3 ≠ 2, and [B]-1 * [A] does not work since 2 ≠ 4. Note that the inverse [B]-1 always has the same number of rows and columns as the original matrix [B]. There's no need to calculate the inverse to complete this step. In our example problem, both matrices are 2 x 2s, so they can be multiplied in either order. There's one more requirement to check before you can take the inverse of a matrix. The determinant of the matrix must be nonzero. If the determinant is zero, the matrix does not have an inverse. Here's how to find the determinant in the simplest case, the 2 x 2 matrix:   2 x 2 matrix: The determinant of the matrix (abcd){\displaystyle {\begin{pmatrix}a&b\\c&d\end{pmatrix}}} is ad - bc. In other words, take the product of the main diagonal (top left to bottom right), then subtract the product of the anti-diagonal (top right to bottom left). For example, the matrix (7423){\displaystyle {\begin{pmatrix}7&4\\2&3\end{pmatrix}}} has the determinant (7)(3) - (4)(2) = 21 - 8 = 13. This is nonzero, so it is possible to find the inverse. If your matrix is 3 x 3 or larger, finding the determinant takes a bit more work:   3 x 3 matrix: Choose any element and cross out the row and column it belongs to. Find the determinant of the remaining 2 x 2 matrix, multiply by the chosen element, and refer to a matrix sign chart to determine the sign. Repeat this for the other two elements in the same row or column as the first one you chose, then sum all three determinants. Read this article for step-by-step instructions and tips to speed this up.  Larger matrices: Using a graphing calculator or software is recommended. The method is similar to the 3 x 3 matrix method, but is tedious by hand. For example, to find the determinant of a 4 x 4 matrix, you need to find the determinants of four 3 x 3 matrices. If your matrix is not square, or if its determinant is zero, write "no unique solution." The problem is complete. If the matrix is square and its determinant is non-zero, continue to the next section for the next step: finding the inverse.
Summary: Understand matrix "division. Confirm the "divisor matrix" is square. Check that the two matrices can be multiplied together. Find the determinant of a 2 x 2 matrix. Find the determinant of a larger matrix. Continue on.