妊娠有腹疼数日，不能生产，人皆曰气虚力弱，不能送子出产门，谁知是血虚胶滞，胞中无血，儿难转身乎！
夫胎之成，成于肾脏之精；而胎之养，养于五脏六腑之血，故血旺则子易生，血衰则子难产。所以临产之前，宜
用补血之药；补血而血不能遽生，必更兼补气以生之，然不可纯补其气也，恐阳过于旺，则血仍不足，偏胜之害，
必有升而无降，亦难产之渐也。防微杜渐，其惟气血兼补乎。使气血并旺，则气能推送，而血足以济之，是汪洋之
中自不难转身也，又何有胶滞之患乎！
方用送子丹。
生黄 （一两） 当归（一两，酒洗） 麦冬（一两，去心） 熟地（五钱，九蒸） 川芎（三钱）
水煎服。二剂而生矣。且无横生倒产之患。此补血补气之药也。二者相较，补血之味，多于补气之品。盖补气
只用黄 一味，其余无非补血之品，血旺气得所养，气生血得所根据，胞胎润泽，自然易产；譬如舟遇水浅之处，虽
大用人力，终难推行，忽逢春水泛滥，舟自跃跃欲行，再得顺风以送之，有不扬帆而迅行者乎！
眉批∶方妙。若头产交骨不开，加炙龟版尾三钱、生过子妇人顶心发三钱，洗净用新瓦一个置火上炕发成灰，
人药同煎，服下即效。
歌括∶妊妇临产数日前，腹痛不生因何缘。
胞中无血身难转，血虚难产理昭然。
送子丹中黄 先，麦归熟地川芎煎。
连服二剂产即易，如同得水顺风船。
During pregnancy, if there is abdominal pain for several days and delivery cannot occur, people generally say it is due to Qi deficiency and weakness, unable to push the fetus out of the birth canal. However, who would know that this is actually due to Blood deficiency causing stagnation, where the uterus lacks Blood, making it difficult for the fetus to turn?
The formation of the fetus originates from the Essence (Jing) of the Kidney; while the nourishment of the fetus relies on the Blood of the Zang-Fu organs. Therefore, abundant Blood facilitates easy delivery, whereas deficient Blood leads to difficult labor. Thus, prior to delivery, one should use herbs that tonify Blood. Since Blood cannot be generated instantly even with tonification, Qi must also be tonified to generate Blood. However, one should not solely tonify Qi, lest Yang become excessively vigorous while Blood remains insufficient. The harm of such imbalance is that Qi may rise without descending, which is a precursor to difficult labor. To prevent trouble before it arises, only by tonifying both Qi and Blood can this be achieved. If both Qi and Blood are robust, Qi can push the fetus forward, and Blood is sufficient to moisten it. Like in a vast ocean, turning around is naturally easy, so how could there be any concern about stagnation?
The formula used is Sendzi Decoction (Songzi Dan).
Raw Radix Astragali (Sheng Huangqi) 30g, Radix Angelicae Sinensis (Danggui) 30g (washed with wine), Radix Ophiopogonis (Maidong) 30g (core removed), Prepared Radix Rehmanniae (Shu Di) 15g (steamed nine times), Rhizoma Chuanxiong (Chuanxiong) 9g.
Decoct in water and take orally. After two doses, delivery will occur. There will be no risk of transverse or breech presentation. This is a formula for tonifying both Blood and Qi. Comparing the two aspects, the ingredients for tonifying Blood outweigh those for tonifying Qi. For tonifying Qi, only Raw Radix Astragali is used; the rest are all Blood-tonifying herbs. When Blood is abundant, Qi receives nourishment; when Qi is generated, Blood has a foundation. The uterus becomes moistened, making delivery natural and easy. It is like a boat encountering shallow water: despite great human effort, it is ultimately difficult to push forward. Suddenly, spring floods arrive, and the boat naturally feels ready to move; aided by a following wind, would it not sail swiftly?
Marginal Note: The formula is excellent. If the fetal head has emerged but the pubic symphysis (Jiaogu) fails to open, add three qian (approx. 9-10g) of Calcined Carapax et Plastrum Testudinis (Zhi Guiban) tail, and three qian (approx. 9-10g) of hair from the vertex of a woman who has previously given birth. Wash clean, place a new tile on fire until the hair turns to ash, decoct together with the medicine, and take orally for immediate effect.
Verse:
When a pregnant woman faces labor days in advance,
Abdominal pain persists, yet birth does not come. Why?
Lacking Blood in the uterus, the body finds it hard to turn,
The principle of difficult labor due to Blood deficiency is clear.
In Sendzi Decoction, Raw Radix Astragali comes first,
With Radix Ophiopogonis, Radix Angelicae Sinensis, Prepared Radix Rehmanniae, and Rhizoma Chuanxiong decocted.
Take two consecutive doses, and delivery becomes easy,
Like a boat gaining water and sailing with the wind.