For the first nine months of a baby's life the support needed is automated. The mother does not need to anything apart from endure the physical and mental discomfort of pregnancy. And as you correctly point out, once the baby is born any number of people can provide the baby with the conditions it needs to survive,
That's easy for you to say, given you will never experience pregnancy or childbirth. The closest you will ever come to feeling any of the pain or challenges of pregnancy and childbirth is seeing someone you care about suffering or possibly dying. Women on the other hand actually have to go through the experience - they don't just get to walk away or watch from the sidelines like you.
I can see how in the past people could be dismissive about the risks and hardships of pregnancy - society was dismissive about lots of hardships that people faced and indifferent to the risk of death if they thought it served the needs of others. We routinely had conscription for men to serve as canon-fodder but values have changed in the last 50 years in many places, whereby conscription ended and the rights and freedoms of individuals to not be forced to risk their well-being became more important in many different aspects of life. Though many of our governments still enact policies that kill/ harm people in other countries if it serves certain social, economic or political interests. But you being so dismissive of the burden of pregnancy on women does not make for a persuasive argument against abortion.
The inequality of the burden faced by mothers will make many women see abortion as the best available option for them despite the sad death of the foetus. You have suggested no solutions for this unequal burden on women compared to men. Your prioritisation of the life of the foetus over the well-being of the pregnant mother is arbitrary. Not sure if it's actually down to your religion as currently many Catholics in this survey seem to be persuaded that that it is more moral to support the right for a woman to choose to have an abortion rather than being forced to continue with their pregnancy and the associated risks to their well-being.
https://www.pewresearch.org/fact-tank/2020/10/20/8-key-findings-about-catholics-and-abortion/Given the unequal burden, it's not surprising that a lot of people came to the conclusion that it is unethical and unjustifiable that a woman can be forced to pay the price for decisions made by a man and a woman, or in the case of rape the decisions made solely by a man.
During the 9 months a mother has to do pretty much everything a man has to do, while also enduring all the physical pain and health complications brought on by pregnancy and childbirth - she has to travel to work and perform her job in order to pay her mortgage or rent, bills and other expenses, undertake the usual physically tiring activities of daily life while trying to cope with nausea and vomiting, shortness of breath as the lungs can't expand fully as the baby grows, painful loosening of pelvic ligaments that make it painful to walk or get up, sit down, turn over, possible separation of abdominal muscles. Giving birth can leave many women with severely weakened pelvic floor muscles and a degree of incontinence. She runs the risk of post-natal depression and back pain.
Pregnancy may result in a woman having to drop out of school or university or getting fired or sidelined from her job. Her productivity or learning of new job skills and responsibilities may reduce due to health issues caused by pregnancy or because she has to take maternity leave. This may have long-term implications for her future salary and pension and she may become vulnerable to exploitation. If she is single she may be more harshly judged by society for an unplanned pregnancy compared to the baby's father or may find it difficult to find a new relationship while pregnant, unlike the father. Or she may be stuck in a bad relationship and become more financially dependent on her partner or vulnerable to emotional or physical abuse due to her restricted options, or the hormones and physical changes caused by the pregnancy.
A bigger issue that you have not provided solutions for is the potentially fatal health complications that can come with pregnancy such as gestational diabetes or high blood pressure that can affect the mother’s kidneys, liver, and brain, cause seizures, coma or be fatal. Pregnant women under 20 face significantly higher risk of serious medical complications. Surely you are not unaware of the many reports of how unsafe childbirth is for the mother and the baby due to the potential for unknown complications during childbirth and inadequate health care - see statistics on maternal deaths in the USA
https://edition.cnn.com/2020/01/30/health/maternal-mortality-statistics-cdc-study/index.html 
