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Until now, experts have always believed that women have a fixed number of eggs that steadily decline in number and quality until they reach the menopause.
However new US research indicates that this isn't necessarily the case - which could, in time, make it possible for women to conceive and give birth much later in life.
The Telegraph reports that a team of academics at Massachusetts General Hospital have managed to identify and extract human stem cells that can 'spontaneously generate' into immature eggs, called oocytes, under laboratory conditions.
The scientists grafted live ovarian tissues into mice to mature these oocytes into egg cells.
Using mice stem cells for the whole process, they then went on to show that this type of cell could be fertilised with sperm to produce embryos.
Dr Jonathan Tilly, who led the research, said that the study "opens the door for development of unprecedented technologies to overcome infertility in women and perhaps even delay the timing of ovarian failure."
He added: "These cells, when maintained outside of the body, are more than happy to make cells on their own and if we can guide that process I think it opens up the chance that sometime in the future we might get to the point of having an unlimited source of human eggs."
The
Daily Mail reports that one in six couples in Britain is estimated to have fertility problems, and the female 'biological clock' has become more of an issue as rising number of women have delayed motherhood to their late 30s and beyond.
Although many of these couples opt for IVF treatment, there are often too few eggs able to be harvested from the woman and egg donors are in short supply.
Dr Allan Pacey, an expert in male fertility at Sheffield University, told
The BBC: "This is a nice study which shows quite convincingly that women's ovaries contain stem cells that can divide and make eggs.
"Not only does this re-write the rule book, it opens up a number of exciting possibilities for persevering the fertility of women undergoing treatment for cancer, or just maybe for women who are suffering infertility by extracting these cells and making her new eggs in the lab."
Would you be willing to donate your eggs? Let us know below...
Click on the image below to find out if you're ready for a baby...
- Independent women
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For superstar mum and business powerhouse Beyoncé, pre-pregnancy accomplishments were integral to being a better parent. She recently revealed she'd held off having a family "to build an empire, relationship and [her] self-worth before becoming a mother."</p>
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If you're having doubts about whether now is the right time or not, Brookes suggests listing your life goals: "... then separate them into goals that are attainable even after a baby and those that would be harder. Which column is fuller? If there are a lot in the latter column it may be an indication that you don't feel ready."</p>
- The time to reevaluate?
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Even if you think your career is your priority, having a baby may change your life goals. According to Brookes: "Having a baby gives us permission to re-evaluate. We're often so busy working and socialising that we never ask: 'Is this what I want anyway?' Prior to having children our focus is on ourselves."</p>
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If you're already pregnant, make the most of your maternity leave. "It's easy to want solely to relax but this can often contribute to that 'unfulfilled' feeling. Seek out local family events and get-togethers with other parents so you start to recognise everyone is having their own challenges and triumphs, too. This also allows you to look forward to a time when you aren't working and of course builds up a bank of positive memories that aren't just career-related," Brookes explains.</p>
- What about the social aspect?
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Fact: Having a baby will impact your social life. How do you feel about that? Brookes suggests asking yourself: "Are you still partying hard and living for the weekends or are you finding yourself staying in more? The more party-hardy your evenings, the chances are you may not be feeling quite ready and haven't done enough."</p>
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She also recommends chatting to friends about anything they've regretted not doing before baby came along - even if you wouldn't miss the same things, it could alert you to something that would only be visible in retrospect.</p>
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- How to silence those fears
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Doubts and fears are a natural part of any big decision. "Actually, they're providing an opportunity to weigh up the pros and cons of a situation, reflect upon where we are at and what needs to change," explains Brookes.</p>
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Chat to other parents for some perspective, and look at your own situation (your health, relationship, etc) to see if it's your environment that's causing you to postpone your decision. <o:p>Brookes adds that: "Having a baby will not prevent you from doing anything unless you let it. Yes, you may need more support but it's doable if you want it enough."<o:p></o:p></o:p></p>
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- When is the right time?
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Over the past decade, the number of women waiting until they are over 40 to have a baby has increased by 50%. The biggest dilemma for some women is the question of balancing career with baby and feeling that they've achieved what they hoped they would.</p>
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As life coach, psychologist and mum of two, Jenny Brookes, explains: "Achieving personal goals before having a baby certainly allows you to more fully engage in the process of being a mum. You enter parenthood with higher self esteem and empowering memories of adventure and achievement which can provide confidence in your own parenting ability."</p>
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