Pregnancy and parenting tips service BabyCenter has launched several new mobile initiatives designed to help subscribers get ready for the big day.

The first initiative consists of getting helpful pregnancy tips to one's mobile phone. To subscribe, expecting mothers are asked to send a text message with the keyword BCDATE and the baby's due date to 44166. Users can also visit http://babycenter.mobi from any Web-enabled mobile device and fill in the subscription form.

"You won't be charged to receive offers from our partners, but you'll pay for the text messages you send and receive according to your agreement with your carrier," the site explains. "If you have an unlimited text message plan, for example, you'll pay nothing for the service."

BabyCenter subscribers receive a confirmation request by text message. To confirm the subscription they are asked to reply YES to 44166.

All subscribers will receive weekly texts chock full of pregnancy advice. Once the baby arrives, the Parenting Tips service sends new parents helpful parenting tips twice a week till three months.

Women can also set up their partner's mobile phone number to receive alerts as well.

To cancel the subscription, users just need to send a text message containing STOP BCTIPS to 44166.

Here is a sample message: "Your fertile window opens today and lasts five more days. Stress can get in the way of conception so relax and get a massage, meditate or take a yoga class."

The service is supported by Alltel, AT&T, Verizon, Sprint, T-Mobile, Boost Cell, Cincinnati Bell, Dobson, Centennial, Nextel, SunCom, Virgin and Cricket.

Also, the site is now expanding its reach with a new Booty Caller service for women who are not pregnant, but trying to conceive.

The service is sponsored by First Response, a pregnancy and ovulation test maker.

The service offers a series of 18 text messages -- three for each menstrual cycle - that tells women when they're most likely to be fertile and provides fertility advice.

To sign up for the Booty Caller service, women are asked to text BCBC to 44166.

Also, BabyCenter's sponsors wanted in on the action.

Aveeno Baby, Cord Blood Registry, Johnson's Baby, Saturn, Viacord and VW Routan are giving interested users the opportunity to opt-in for special promotions.

All users need to do is send a text message with the keyword BCOFFERS to 44166.