宝宝的护照上面说必须有签名才有效。宝宝的社会安全卡上也有签名的地方。可小娃娃们不能写字。我找了一下老帖，有一些正确的答案，混杂在不正确的信息里，而且没有官方信息的连接。现在我把我google的结果放上来，省得大家都要上网找半天官方信息。

１。护照需要父母之中一人代签：先Print宝宝的名字，再Sign父母某一人的名字，跟着括号里注明是mother还是father.　官方说法在这：

http://travel.state.gov/passport/fri/faq/faq_1741.html#ca63
My child is too young to sign his/her own passport. How do I sign my child\'s passport?
In the space provided for the signature, the mother or father must print the　child\'s name and sign their own name. Then, in parenthesis by the parent\'s name, write the word (mother) or (father) so we know who signed for the child.


２。社会安全卡是不能由父母代签的。要等到宝宝长大了自己签（18岁，或参加第一份工作，哪个早算哪个）。官方说法在这：

http://ssa-custhelp.ssa.gov/cgi-bin/ssa.cfg/php/enduser/std_adp.php?p_faqid=237&p_created=956256492&p_sid=GZDG4KJi&p_accessibility=0&p_redirect=&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9NjUsNjUmcF9wcm9kcz0mcF9jYXRzPSZwX3B2PSZwX2N2PTEuMTYmcF9wYWdlPTE*&p_li=&p_topview=1
I\'m expecting my first baby this year. What do I need to do to get a Social Security number for my baby?
It is a good idea to apply for a number at the hospital when you apply for your baby’s birth certificate. The state agency that issues birth certificates will share your child’s information with us, and we will mail the Social Security card to you.

Or, you can wait and apply at any Social Security office or by mail. If you wait, here is what you need to do to apply for a Social Security number for your child:
? Complete an Application For A Social Security Card (Form SS-5);
and
? Show us documents proving your child’s:
? U.S. citizenship;
? Age; and
? Identity.
? Show us a document proving your identity.

All documents must be either originals or copies certified by the issuing agency. We cannot accept photocopies or notarized copies of documents.

We must verify your child’s birth record, which can add up to 12 weeks to the time it takes to issue a card. We will mail your child’s number and card as soon as we have verified your documents with the issuing offices.

For more information, see Documents You Need for a Social Security Card.

Children should not sign their Social Security card until their first job or age 18, whichever comes first. A signature on the card is not required for the card to be valid.

Keep your child’s Social Security card in a safe place with your other important papers. Do not carry it with you.