以下を含む、人間の生殖の各段階で発生する可能性のあるいくつかの合併症があります。

排卵：排卵合併症には、不規則な排卵、卵の生産に関する問題、卵巣からの卵の放出に関する問題が含まれます。

受精：受精の合併症には、妊娠の困難、精子の生成の問題、および精子の運動性に関する問題が含まれます。

着床：移植の合併症には、子宮内の卵の着床の困難、卵管への移植（異所性妊娠）、または移植の失敗がまったく発生しないことが含まれます。

胎盤の発達：胎盤の合併症には、胎盤の急激な発生や胎盤前の胎盤の成長と発達の問題が含まれます。

胎児の発達：胎児の発達の合併症には、先天性欠損症や臓器形成の問題など、胎児の成長と発達の問題が含まれます。

労働と分娩：労働と分娩の合併症には、労働の進行の困難、赤ちゃんの出産の合併症（砲尾の症状や頭骨の不均衡など）、または胎盤の出産の問題が含まれる場合があります。

これらは、人間の生殖の各段階で発生する可能性のある最も一般的な合併症のほんの一部ですが、他にも多くの潜在的な問題が発生する可能性があります。妊娠中および出産を通して潜在的な合併症を監視および管理するために、医療提供者と協力することが重要です。
There are several complications that can occur during each stage of human reproduction, including:

Ovulation: Ovulation complications can include irregular ovulation, problems with the production of eggs, and problems with the release of eggs from the ovaries.

Fertilization: Fertilization complications can include difficulty conceiving, problems with the production of sperm, and problems with the motility of sperm.

Implantation: Implantation complications can include difficulties with the implantation of the egg in the uterus, implantation in the fallopian tubes (ectopic pregnancy), or failure of the implantation to occur at all.

Placental development: Placental complications can include problems with the growth and development of the placenta, such as placental abruption or placenta previa.

Fetal development: Fetal development complications can include problems with the growth and development of the fetus, such as birth defects or problems with organ formation.

Labor and delivery: Labor and delivery complications can include difficulties with the progression of labor, complications with the delivery of the baby (such as breech presentation or cephalopelvic disproportion), or problems with the delivery of the placenta.

These are just some of the most common complications that can occur during each stage of human reproduction, but there are many other potential issues that can arise as well. It's important to work with a healthcare provider to monitor and manage any potential complications throughout the pregnancy and delivery.