Jupiter is an old and big planet and affects the human life with its expanding nature. Jupiter is the Karak (significator) planet for marriage and childbirth. Let’s see why it is Karak for these events and how it affects such events.

Marriage is an important event in one’s life. Marriage means expansion of family and to perform the rituals of marriage, we need Pandit, Priest or Kaazi. Here, the role of Jupiter is played by all three of them. In Hindu marriages, there is a tradition of applying turmeric (Haldi) on the skin of the bride. This tradition is known as ‘Haath peele karna’ (coloring the hands yellow by turmeric) and here turmeric or yellow color is related to Jupiter. 
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 Childbirth means expansion of family and therefore, Jupiter is Karak for childbirth too. The same applies in terms of education, which is an expansion of knowledge and wisdom. Similarly, if Jupiter is connected with wealth, it will bestow you with financial gain.If Jupiter is weak in someone’s horoscope then it cause troubles and delays in expansions like: marriage, childbirth, growth in salary, and financial benefits. From the prospects of health, Jupiter increases the level of fats in our body. For example, if Jupiter is connected to ‘diabetes’ then it will raise the sugar level in the body. 

When we say that a particular planet is weak in a horoscope, it doesn’t always means that it is in debilitated state. Positioning of a planet in malefic houses like: 8th, 12th, and 6th are also the factors which make a planet weak. Further, a planet is considered weak, if it is placed in the star of a malefic planet having lordship of 6th, 8th, 12th house or is in weak Shadbal. A debilitated Jupiter in 2nd house having lordship of good houses can give immense wealth, like we can see in charts of Sachin Tendulkar and Aishwarya Rai. I have seen many cases where positioning of Jupiter in 8th house results in delays and hurdles in marriage and children. 
Other than Jupiter, analyzing the related houses and their lords is very important before coming to the final decision. If someone is facing problems in marriage or childbirth, they need to check Jupiter with relevant house and its lord.
Before coming on final conclusion, we need to analyze complete chart and perform the suggested remedies.